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Large selection of replacement water filters, reverse osmosis membranes, testing kits and water filtration repair parts.  From one water filter or reverse osmosis membrane to case quantity discounts.
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Harmsco ®  Replacement Water Filters & WaterBetter Replacement Sediment Filters

Harmsco ® HB-10-1-W 10 Inch 1 Micron Big Blue Water Filter

Harmsco ® HB-10-1-W 10 Inch 1 Micron Big Blue Water Filter

Price Each: $19.99

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Harmsco ® HB-10-1-W 10 Inch Big Blue Water Filter - 9 3/4" Long by 4 1/2" diameter - 1 Micron Big Blue - 8 per case, sold individually. Made with a proprietary blend of Polyester-PlusTM filter media. Cleanable and reusable in most applications, individually shrink wrapped. Flow rates Up to 15 GPM (56 LPM). Order a case and save even more.

Harmsco ® HB-10-5-W Big Blue 5 Micron Water Filter

Harmsco ® HB-10-5-W Big Blue 5 Micron Water Filter

Price Each: $19.99

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Harmsco ® HB-10-5-W Big Blue 5 Micron Water Filter - 9 3/4" Long by 4 1/2" diameter - 5 Micron Big Blue - 8 per case, sold individually. Made with a proprietary blend of Polyester-PlusTM filter media. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 15 GPM (56 LPM). Order a case and save even more.

Harmsco ® HB-10-20W Big Blue Water Filter


Harmsco ® HB-10-20W Big Blue Water Filter


Price Each: $24.99
Sale Price: $18.99
Savings: $6.00

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Harmsco ® HB-10-20W Big Blue Water Filter - 9 3/4" Long by 4 1/2" diameter - 20 Micron Big Blue - 8 per case, sold individually. Made with a proprietary blend of Polyester-PlusTM filter media. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 15 GPM (56 LPM). Order a case and save even more.

Harmsco ® HB-10-20W-AM Big Blue Antimicrobial Water Filter
 

Price Each: $32.99
Sale Price: $23.99
Savings: $9.00


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Harmsco ® HB-10-20W-AM Big Blue Antimicrobial Water Filter

Harmsco ® HB-10-20W-AM Big Blue Antimicrobial Water Filter. Antimicrobial Replacement Water Filter Cartridge - Step up to The Premium Quality Of Antimicrobial Construction. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 15 GPM (56 LPM). Order a case and save even more.

Harmsco HB-10-50W Big Blue 50 Micron Sediment Water Filter
 

Price Each: $27.99
Sale Price: $19.99
Savings: $8.00


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Harmsco HB-10-50W Big Blue 50 Micron Sediment Water Filter

Harmsco HB-10-50W Big Blue 50 Micron Sediment Water Filter. 9 3/4" Long by 4 1/2" diameter - 50 Micron Big Blue - 8 per case, sold individually. Made with a proprietary blend of Polyester-PlusTM filter media. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 15 GPM (56 LPM). Order a case and save even more.

Harmsco ® HB-10-50W-AM Big Blue Antimicrobial Water Filter
 

Price Each: $32.99
Sale Price: $23.99
Savings: $9.00


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Harmsco ® HB-10-50W-AM Big Blue Antimicrobial Water Filter

Harmsco ® HB-10-50W-AM Big Blue Antimicrobial Water Filter. Antimicrobial Replacement Water Filter Cartridge - Step up to The Premium Quality Of Antimicrobial Construction. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 15 GPM (56 LPM). Order a case and save even more.

Harmsco ® HB-20-1-W 20 Inch Big Blue Water Filter


Harmsco ® HB-20-1-W 20 Inch Big Blue Water Filter


Price Each: $39.99
Sale Price: $34.99
Savings: $5.00

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Harmsco ® HB-20-1-W 20 Inch Big Blue Water Filter - 20" Long by 4 1/2" diameter - 1 Micron Big Blue - 4 per case, sold individually. Made with a proprietary blend of Polyester-PlusTM filter media. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 130 GPM (113 LPM) Order a case and save even more.

Harmsco ® HB-20-5-W 20 Inch Big Blue Water Filter


Harmsco ® HB-20-5-W 20 Inch Big Blue Water Filter


Price Each: $34.99
Sale Price: $31.99
Savings: $3.00

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Harmsco ® HB-20-5-W 20 Inch Big Blue Water Filter - 20" Long by 4 1/2" diameter - 5 Micron Big Blue - 4 per case, sold individually. Made with a proprietary blend of Polyester-PlusTM filter media. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 130 GPM (113 LPM) Order a case and save even more.

Harmsco ® HB-20-20-W 20 Inch Big Blue Water Filter


Harmsco ® HB-20-20-W 20 Inch Big Blue Water Filter


Price Each: $34.99
Sale Price: $31.99
Savings: $3.00

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Harmsco ® HB-20-20-W 20 Inch Big Blue Water Filter - 20" Long by 4 1/2" diameter - 20 Micron Big Blue - 4 per case, sold individually. Made with a proprietary blend of Polyester-PlusTM filter media. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 130 GPM (113 LPM) Order a case and save even more.

Harmsco ® HB-20-20W-AM Big Blue 20 Inch Antimicrobial Water Filter
 

Price Each: $53.99
Sale Price: $39.99
Savings: $14.00


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Harmsco ® HB-20-20W-AM Big Blue 20 Inch Antimicrobial Water Filter

Harmsco ® HB-20-20W-AM Big Blue 20 Inch Antimicrobial Water Filter. Antimicrobial Replacement Water Filter Cartridge - Step up to The Premium Quality Of Antimicrobial Construction. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 130 GPM (56 LPM). Order a case and save even more.

Harmsco HB-20-50W Big Blue 50 Micron Sediment Water Filter 20 inch
 

Price Each: $48.99
Sale Price: $34.99
Savings: $14.00


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Harmsco HB-20-50W Big Blue 50 Micron Sediment Water Filter 20 inch

Harmsco HB-20-50W Big Blue 50 Micron Sediment Water Filter 20 inch. 20" Long by 4 1/2" diameter - 50 Micron Big Blue - 4 per case, sold individually. Made with a proprietary blend of Polyester-PlusTM filter media. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 130 GPM (113 LPM) Order a case and save even more.

Harmsco ® HB-20-50W-AM Big Blue 20 Inch Antimicrobial Water Filter
 

Price Each: $53.99
Sale Price: $39.99
Savings: $14.00


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Harmsco ® HB-20-50W-AM Big Blue 20 Inch Antimicrobial Water Filter

Harmsco ® HB-20-50W-AM Big Blue 20 Inch Antimicrobial Water Filter. Antimicrobial Replacement Water Filter Cartridge - Step up to The Premium Quality Of Antimicrobial Construction. Cleanable and reusable in most applications; individually shrink wrapped. Flow rates Up to 130 GPM (56 LPM). Order a case and save even more.


Harmsco High Flow Rate Replacement Sediment Water Filter Cartridges
 

Harmsco 801 HIF Sediment Filter
 


Price Each: $13.99
Sale Price: $7.99
Savings: $6.00

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Harmsco 801 HIF Replacement Sediment Filter

Harmsco 801 HIF Replacement Sediment highly efficient filter cartridges made of pleated Polyester-PlusTM filter media for low pressure drop, high flow capability, increased contaminant removal, long filter runs, reusability and the lowest cost per gallon filtered. • Pleated design with up to 50% more surface area than competitive filters resulting in superior performance & increased contaminant removal • Longer filtration runs for fewer change-outs and less maintenance • Low pressure drop • Thermally bonded for longer usable life • FDA approved materials - NSF 61 certified • Engineered media for superior performance. High temperature (200 degree F) version in HT 20 micron available. HIF 7, HIF 14, HIF 16, HIF 21, HIF 24, Filter Housings, Harmsco Up-Flow High-Capacity Filters HIF 42, HIF 75, HIF 100, HIF 150FL, HIF 200FL, Harmsco Band Clamp Filters BC4-1-T-EP, BC4-2-T-EP, BC4-3-T-EP, BC6-1-T-EP, BC6-2-T-EP, BC6-3-T-EP

Micron End Cap Color - 0.35 Brown - 1 Tan - 5 White - 10 Red - 20 Blue - 50 Yellow - 100 Green

Harmsco ® WB-1-W Water Filter


Harmsco ® WB-1-W WaterBetter Replacement Sediment 1 Micron Water Filter


Price Each: $7.99

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Harmsco ® WB-1-W WaterBetter Water Filter - Replacement Sediment 1 Micron - 9 3/4" L x 2 3/4" D - Polyester - Pressure drop with Harmsco cartridges is exceptionally low due to our pleated design and increased filter area. 24 per case, sold individually. Order a case and save even more.

Harmsco ® WB-5-W Water Filter


Harmsco ® WB-5-W WaterBetter Replacement Sediment 5 Micron Water Filter


Price Each: $7.99

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Harmsco ® WB-5-W WaterBetter Water Filter - Replacement Sediment 5 Micron - 9 3/4" L x 2 3/4" D - Polyester - Pressure drop with Harmsco cartridges is exceptionally low due to our pleated design and increased filter area. 24 per case, sold individually. Order a case and save even more.

Harmsco ® WB-20-W Water Filter


Harmsco ® WB-20-W WaterBetter Replacement Sediment 20 Micron Water Filter


Price Each: $7.99

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Harmsco ® WB-20-W WaterBetter Water Filter - Replacement Sediment 20 Micron - 9 3/4" L x 2 3/4" D - Polyester - Pressure drop with Harmsco cartridges is exceptionally low due to our pleated design and increased filter area. 24 per case, sold individually. Order a case and save even more.

Harmsco 921-5 Replacement Sediment 5 Micron 10 Inch Water Filter
 

Price Each: $19.99
Sale Price: $12.99
Savings: $7.00


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Harmsco 921-5 WaterBetter Replacement Sediment 5 Micron 19 1/2 Inch Water Filter

Harmsco 921-5 Replacement WaterBetter Sediment 5 Micron 19 1/2 Inch Water Filter. White end caps.

Harmsco 931-5 Replacement Sediment 5 Micron 20 Inch Water Filter
 

Price Each: $27.99
Sale Price: $19.99
Savings: $8.00


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Harmsco 931-5 WaterBetter Replacement Sediment 5 Micron 29 1/4 Inch Water Filter

Harmsco 931-5 WaterBetter Replacement Sediment 5 Micron 29 1/4 Inch Water Filter. White end caps.

Harmsco 931-20 Replacement Sediment 20 Micron 20 Inch Water Filter
 

Price Each: $27.99
Sale Price: $19.99
Savings: $8.00


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Harmsco 931-20 WaterBetter Replacement Sediment 20 Micron 29 1/4 Inch Water Filter

Harmsco 931-20 WaterBetter Replacement Sediment 20 Micron 29 1/4 Inch Water Filter. Blue end caps.


Harmsco Absolute 1 Micron Replacement Water Filters
 
Harmsco PP-S-1 POLY-PLEAT 1 Micron Absolute Sediment Water Filter
 

Price Each: $24.99
Sale Price: $17.99
Savings: $7.00


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Harmsco PP-S-1 POLY-PLEAT 1 Micron Absolute Sediment Water Filter

Harmsco PP-S-1 POLY-PLEAT 1 Micron Absolute Sediment Water Filter. Harmsco® Absolute Rated Filter Cartridges for Safe, Cyst-free Drinking Water. PP-S-1 water filter is a 1 absolute sediment water filter. POLY-PLEAT™ Filter Cartridges Substantially Remove: . Cryptosporidium . Giardia cysts . Harmful organisms . Sediment . Silt . Turbidity . And more!. . Absolute rated one micron filter media removes cyst-sized particles for safe, cyst-free drinking water. . Pleated polypropylene filter media provides more surface area for longer filter life and increased particle removal. . FDA listed materials for use in potable water and liquid food applications. . End caps, center tubes and media are thermally bonded as one integral component for added strength and to provide superior end sealing. . Full product line for standard, Big-Blue and Hurricane® filter housings.Low Pressure Drop Initial pressure drop using POLY-PLEAT™ cartridges is exceptionally low due to our pleated design and increased surface area. . Economical cartridges from the value leader in the industry! 9-3/4 x 2-3/4. 24 per case. Sold and priced individually. Buy a full case and save even more.


Harmsco Carbon Replacement Water Filters
 

Harmsco HAC-10-W Activated Carbon Replacement Water Filter
 

Price Each: $19.99
Sale Price: $13.99
Savings: $6.00


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Harmsco HAC-10-W Activated Carbon Replacement Water Filter

Harmsco’s activated carbon cartridges outperform “canister” and “impregnated” types of cartridges due to their increased carbon content, cellulose-free construction, wet molding process and dual-stage construction. 1.5 GPM max flow rate. 24 per case. HIF 7, HIF 14, HIF 16, HIF 21, HIF 24, Filter Housings, Harmsco Up-Flow High-Capacity Filters HIF 42, HIF 75, HIF 100, HIF 150FL, HIF 200FL, Harmsco Band Clamp Filters BC4-1-T-EP, BC4-2-T-EP, BC4-3-T-EP, BC6-1-T-EP, BC6-2-T-EP, BC6-3-T-EP Priced and sold individually. Order a case and save even more.

Harmsco WBAC-10-W Replacement Carbon Filter
 

Price Each: $19.99
Sale Price: $14.99
Savings: $5.00


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Harmsco WBAC-10-W Replacement Carbon Filter

Harmsco WBAC-10-W Replacement Carbon Filter


Parts Department Featured Items For Water Filtration And Reverse Osmosis RO Systems
 
TDS Meter - Tester To Test For Total Disolved Solids In Water


How Pure Is Your Water?    Find Out!

Price Each: $37.99

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TDS Meter - Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester - TDS Meter

TDS Meter - Tester. The Only Way To Know If Your Reverse Osmosis RO Membrane Is Performing Correctly - Tests for TDS - Total Dissolved Solids. A Must For All RO System Owners. Compare Incoming Feed Water To Treated Water - Replace Membrane If Less Than 80% of TDS Is Being Removed - Total dissolved solids (TDS) are the total weight of all solids (minerals, salts or metals) that are dissolved in a given volume of water expressed in milligrams per liter (mg/L), or in parts per million (PPM). The lower the TDS level in the water, the more efficiently your body's cells actually get hydrated by the water that you drink. The higher the TDS levels in the water, the greater the probability of harmful contaminants that can pose health risks or hinder the absorption of water molecules on the cellular level. 17 PPM of TDS = 1 grain of hardness. Highly efficient and accurate due to its advanced microprocessor technology. Hold Function: saves measurements for convenient reading and recording. Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries. Measurement Range: 0-9990ppm. From 0-999ppm, the resolution is in increments of 1ppm. From 1,000 to 9,990ppm, the resolution is in increments of 10ppm, indicated by a blinking 'x10' image. Display: large and easy-to-read LCD screen. Factory Calibrated: recalibration is not necessary, but can be done easily with a watch screwdriver. There's no need for messy solutions to initially calibrate the meter. Range: 0 - 9990ppm (mg/L) Accuracy: +/- 2% ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius (33 to 122 degrees Fahrenheit) Power source: 2 x 1.5V button cell batteries (included) Battery life: over 1,000 hours of continuous use Dimensions: 14 x 2.3 x 1.5cm (5.5 x .9 x .55 inches) Weight: 32g (1.13 oz) Simple to use for Reverse Osmosis membrane monitoring. Measure the incoming water and the RO water. Divide the larger number into the smaller number and subtract that decimal from 1. The resulting decimal is the percent of TDS that the membrane is removing. We really like this tester and think that anyone who wants to know about the quality of their water should have one of these TDS Meter Testers.

Learn more about using TDS meters and total dissolved solids

TDS Meter - Easily Installs Inline
 

Price Each: $49.99
Sale Price: $39.99
Savings: $10.00

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TDS Meter Inline Tester- Dual Mode Reading - Easily Installs Inline - Very Simple To Use

TDS Meter - Dual Mode - Installs Inline - Check the TDS level with the push of a button. Now you can easily check to make sure the water from your reverse osmosis system is top quality. Measure the tap water coming in vs. the purified water going out of your system at any time. Very easy installation. Simply cut the line out from the RO membrane housing and install the inline probe between the membrane housing and the shutoff valve, when possible. The closer to the membrane housing the better. Insert the ends of the tube into the John Guest quick connectors on the TDS meter probe. Then cut the inlet feed water line to the system and install the other T/probe. FEATURES Displays TDS levels of the feed water and product water with in & out electrode probes. Highly efficient and accurate due to its advanced microprocessor technology. Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use. Dual Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.) Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. Comes equipped with John Guest Quick-Connect T-fittings as shown. Installs quickly and easily. SPECIFICATIONS Range: 0-9990 ppm Accuracy: ±2% Cable Length: 24.5" (including sensor) Power source: 2 x 1.5V button cell batteries (included) Battery life: over 1000 hours of continuous use Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.) Weight: 79.4 g (2.8 oz.) Always know if your RO membrane is performing correctly!

Learn more about using TDS meters and total dissolved solids

Dow Corning ® 111 5 gram O-ring Silicone Lubricant and Sealant


Prevent Leaks!


Price Each: $3.99

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Dow Corning (Molykote) ® 111 6 gram O-ring Silicone Lubricant and Sealant - Be sure to lube your O-rings to help prevent leaks.

Dow Corning/Molykote ® 111 6 gram O-ring Silicone Lubricant and Sealant - 6 gram pillow pack. (like a ketchup packet) Great O-ring sealant and lubricant. FDA and NSF approved. (Do Not Use Petroleum Jelly As It May Break Down O-rings Or Housings) This is the same premium grade silicone sealant and lubricant used in underwater photography cameras, scuba gear and other underwater applications that simply can't afford leaks. Why not use the best for your reverse osmosis or drinking water filtration system?

Dow 111 Silicone MSDS Safety Sheet

Leak Controller for Reverse Osmosis Systems, Refrigerators, Ice Makers and Coffee Machines
 


Price Each: $79.99
Sale Price: $49.99
Savings: $30.00

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Leak Controller for Reverse Osmosis Systems, Water Coolers, Refrigerators, Ice Makers and Coffee Machines.

Save a flood inside the house. Prevent costly water damage. Automatically shut off the water to leaking Reverse Osmosis Systems, Water Coolers, Refrigerators, Ice Makers and Coffee Machines. Alarm flashes and beeps to notify you to the system shut down. Very simple to install and use. Brilliant design. Simply place the sensor (Similar in size to a small computer mouse) where water will collect below the system. Cut the incoming 1/4" or 3/8" water tube and insert each end into the quick connectors on the controller. When the sensor gets wet it shuts off the incoming water at the controller. Reset the sensor by wiping it dry. # AS-414 with 4 1/2' cord that connects the sensor. The Leak Controller is a great way to control costly leaks.

Pro Products Sani - System Sanitizer
 

Price Each: $7.99
Sale Price: $4.99
Savings: $3.00

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Pro Products Sani System Sanitizer

Pro Products Sani System Sanitizer. 0.25 or 0.5 fl. oz. concentrate. Sani-System ® Pro Products is proud to introduce Sani-System, the first and only EPA product approved for sanitizing water softeners, RO units and Water Coolers. Sani System is proven to kill 99.9% of E. coli, E. coli O157:H7, Staphylococcus aureus, Listeria monocytogenes and other harmful bacteria. It does not use chlorine, other oxidizers or acids that can harm water softener equipment parts. Use is simple; each dose comes in a pre-measured pouch. Just cut, pour and regenerate softener. No measuring, No mess! Sanitizing Equipment! Applications Interior Surfaces of Water Softeners, Reverse Osmosis (RO) Units, Ice Machines, Water Coolers, Water Holding Tanks and Pressure Tanks. Sani-System is now NSF certified! Directions for Use It is a violation of Federal Law to use this product in a manner inconsistent with its labeling. Sanitization of Interior Surfaces of Water Softeners and Reverse Osmosis (RO) Units. Water Softeners Sanitization should occur after initial installation, after the system is serviced and periodically during its use. Backwash the softener and add 1 ounce of sanitizer per 8 gallons of water (200 ppm active quaternary) to the brine tank well. (NOTE: standard systems capacity is 48 gallons,) (The brine tank should have water in it to permit the solution to be carried into the softener.) Proceed with the normal regeneration or interrupt the cycle after the brining step and let the softener soak for a minimum of 60 seconds. Backwash the softener with potable water to make sure all sanitizing solution is thoroughly rinsed from the unit before returning it to service. Reverse Osmosis (RO) Units Sanitization should occur after initial installation, after the system is serviced and periodically during its use. Turn off RO system, drain storage tank and remove membrane element and pre-filters. Put membrane element in a plastic bag so it remains wet. Fill empty pre-filter housing with 1 ounce of sanitizer per 8 gallons of water (200 ppm active sanitizer) and turn on raw water. (NOTE: standard system capacity is 2-3 gallons) After holding tank is full, let system stand idle for a minimum of 60 seconds. Turn off water. Drain holding tank. Before the system is put back into service, flush system with potable water to assure sanitizing solution is rinsed thoroughly form system. Follow the manufacturer’s directions for re-installation of new per-filters, membrane elements and post filter, membrane element and post filter. Sanitation of interior surfaces of Ice Machines, Water Coolers, Water holding tanks and Pressure tanks, Ice Machines Sanitization should occur after initial installation, after the machine is serviced and periodically during its use. Shut off incoming water line to machine. Prepare a solution of 1 oz. of sanitizer per 8 gallons of water (200 ppm active quaternary) Circulate solution through machine making user to wet all surfaces and allow a minimum contact of 60 seconds. Drain and completely flush system twice with portable water. Storage and disposal DO NOT CONTAMINATE WATER, FOOD OR FEED BY STORAGE OR DISPOSAL - Store in a dry place no lower in temperature then 50 degrees F or higher than 120 degrees F. Shipping information Non-hazardous. This is the best sanitizing solution available anywhere! Stock up and save.


Be sure to check our Parts Department for important parts such as TDS Testers For Reverse Osmosis Membranes, Replacement Tanks, O-rings , Filter Housing Wrenches, Faucets, Pumps, Fittings, UV Systems and more parts for your reverse osmosis pure water filtration system.   View maintenance and servicing tips online at our Installation & Trouble shooting Guide.

* Harmsco ® is the registered trademark of Harmsco,  the manufacturer of Harmsco  ® brand water treatment equipment. 


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Replacement water filters and reverse osmosis membranes