Replacement water filters, RO reverse osmosis membranes and whole house filter systems. Refrigerator water filters, pool and spa filter. Pentek, OMNIFILTER water filters. Chiller Daddy water chillers

Search
Cart ()
Order Tracking
Reorder
Toggle Nav
Home
Replacement Water Filters
Reverse Osmosis Systems
Whole House Water Filters
Refrigerator Water Filters
Water Testing
Pool and Spa Filters
Boat & RV Water Filters
Parts Department
Water Chillers
Installation and Trouble Shooting Guide
Specialty Water Filters
Well Water
Gift Guide
Toggle Nav
Cart ()
Order Tracking
Search
Advanced Search
Menu
Menu
Account

Large selection of replacement water filters, reverse osmosis membranes, testing kits and water filter system repair parts. From one water filter or membrane to case quantity discounts.

LOW PRICES and FAST SHIPPING SINCE 1999 !

99.5% Of All Items In Stock For Same Day Shipping!

TDS Meters - Total Dissolved Solids

TDS Meters - Total Dissolved Solids

 

How Pure Is Your Water? Find Out!

Learn more about using TDS meters and total dissolved solids in your water.

Every owner of a RO Reverse Osmosis System needs to know the TDS of the incoming feed water and the product drinking water.  You need a TDS meter to do this.

Easy TDS Membrane Performance Calculator
See If It is Time To Replace Your Membrane
Submit

Simply enter your Feed Water TDS and RO Water TDS into the boxes above and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.

See our selection of TDS meters under Water Tests

  1. WATERPROOF EC / TDS / TEMP COMBO METER / PROFESSIONAL TESTER - HM Digital COM-100
    WATERPROOF EC / TDS / TEMP COMBO METER / PROFESSIONAL TESTER - HM Digital COM-100
    FOR THE PROFESSIONAL ! ------ COMBO METER / TESTER FOR EC / TDS / TEMP - WATERPROOF. The only handheld TDS meter / EC meter with full scale digital calibration. A water tester that is perfect for both consumer or commercial use. Ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more.
    Learn More
    $76.95 Special Price $59.99 As low as $47.99
    Add to Wish List Add to Compare
  2. HM DIGITAL- TDS Meter EZ-HMD To Test for total dissolved solids in Water -1000
    TDS Meter EZ - HMD To Test For Total Dissolved Solids In Water
    TDS Meter - Tester To Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester
    Learn More
    $35.99 Special Price $19.99
    Add to Wish List Add to Compare
  3. TDS-N TDS Meter. Test your water for total dissolved solids.
    TDS-N TDS Meter. Test your water for total dissolved solids.
    TDS-N TDS Meter. Test your water for total dissolved solids.
    Learn More
    $39.99 Special Price $27.00
    Add to Wish List Add to Compare
  4. TDS Meter - Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester - TDS Meter
    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
    Learn More
    $49.99 Special Price $37.99 As low as $17.99
    Add to Wish List Add to Compare
  5. TDS Meter Inline Water Tester DM1 - HM Digital Dual Mode Reading
    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. 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. Comes equipped with John Guest Quick-Connect T-fittings as shown. Installs quickly and easily. SPECIFICATIONS Range: 0-9990 ppm Accuracy: ±2% Always know if your RO membrane is performing correctly!
    Learn More
    $49.99 Special Price $39.99 As low as $19.99
    Add to Wish List Add to Compare
  6. TDS Water Meter Dual Mode Readings - DM2 HM Digital Professional Grade
    TDS Water Meter Dual Mode Readings - DM2 HM Digital Professional Grade - Easily Installs Inline - Very Simple To Use
    TDS Meter Dual Mode Readings - Professional Grade - Easily Installs Inline - Very Simple To Use. Measure the tap water coming in vs. the purified water going out of your system at any time. Use the meter to determine when the filters need to be changed. Highly efficient and accurate due to its advanced microprocessor technology. Displays TDS levels of the Feed Water and Product Water with in & out electrode probes. Auto-Off function conserves battery power. The unit shuts off automatically after 20 seconds. Dual Range - Measures from 0-999 ppm, with a resolution of 1 ppm.
    Learn More
    $69.99 Special Price $49.99 As low as $29.99
    Add to Wish List Add to Compare
  7. HM Digital AP-1 AquaPro Water Quality TDS Total Dissolved Solids Tester
    HM Digital AP-1 AquaPro Water Quality TDS Total Dissolved Solids Tester
    HM Digital AP-1 AquaPro Water Quality Total Dissolved Solids Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, +/- 2% Readout. HM Digital introduces its new AquaPro series, a line of handheld TDS/EC meters with a sleek design that's perfect for today's modern kitchen. The AquaPro digital water testers are the next generation for today's tech-savvy and health-conscience consumer.
    Learn More
    $42.95 Special Price $29.99 As low as $20.00
    Add to Wish List Add to Compare
  8. Hanna ® TDS Calibration Solution Packet # 70032 For Water Testing TDS Meters
    Hanna ® TDS Calibration Solution Packet # 70032 For Water Testing TDS Meters
    Hanna ® TDS Calibration Solution 1382 PPM for calibrating TDS Meters / Testers to use for testing Reverse Osmosis RO Systems. # 70032
    Learn More
    $8.99 Special Price $4.99 As low as $2.99
    Add to Wish List Add to Compare
  9. TDS-3 Handheld Pure Water Testing Meter For Total Dissolved Solids
    TDS-3 Handheld Pure Water Testing Meter For Total Dissolved Solids With Carrying Case

    TDS-3 Handheld Pure Water Testing Meter For Total Dissolved Solids With Carrying Case. HM Digital. Features Ideal for commercial use. Includes a carrying case with belt clip. 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: 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1ppm. From 1000 to 9990 ppm, the resolution is in increments of 10ppm, indicated by a blinking 'x10' image. Built-in digital thermometer Display: large and easy-to-read LCD screen. Factory Calibrated.

    Learn More
    $59.99 Special Price $39.99 As low as $24.99
    Add to Wish List Add to Compare
  10. HMI SP-3-Probe Set HM Digital SP-3 Replacement Probe Set For DM-1 TDS Meter
    HMI SP-3-Probe Set HM Digital SP-3 Replacement Probe Set For DM-1 TDS Meter
    HM Digital SP-3 Replacement Probe Set For DM-1 TDS Meter
    Learn More
    $19.99
    Add to Wish List Add to Compare
Parts Department
Parts Department

Replacement water faucets, water pumps, tanks, UV, drain saddles, o-rings, wrenches, valves, water accumulator tanks, fittings, TDS meters, water filters, reverse osmosis membranes, parts for reverse osmosis and pure water drinking systems. Low prices and fast shipping online since 1999. Quantity discounts. Millions sold. DIY HELP Guides.

More
Water Chillers
Water Chillers

Chiller Daddy Water Chillers for RO reverse osmosis water purification systems - Chiller Daddy CHL-501 & CHL-750XL Undersink and under cabinet water chillr.

More
Installation and Trouble Shooting Guide
Installation and Trouble ...

Water Filter System and Reverse Osmosis System Installation and Service Guide. Huge inventory of replacement water filters , reverse osmosis membranes and maintenance service parts. Low prices and fast shipping online since 1999. Millions sold.

More
Faucets for RO Reverse Osmosis or Filter Systems
Faucets for RO Reverse ...

Replacement Air Gap and Non Air Gap Faucets For Reverse Osmosis RO Systems, Pure Water Systems And Water Coolers - TouchFlo Faucets. Low prices and fast shipping online since 1999. Millions sold. Quantity discounts. DIY HELP Guides.

More
Leak Controllers
Leak Controllers

Leak Controller For Reverse Osmosis Systems, Refrigerators, Ice Makers and Coffee Machines. Low prices and fast shipping online since 1999. Millions sold. Quantity discounts. DIY HELP Guides.

More
Tanks
Tanks

Amtrol Reverse Osmosis Accumulator Water Storage Tanks - Water tanks for reverse osmosis drinking water systems. Low prices and fast shipping online since 1999. Millions sold. Quantity discounts. DIY HELP Guides.

More

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.

Search


Easy TDS Membrane Performance Calculator
See If It is Time To Replace Your Membrane
Submit

Simply enter your Feed Water TDS and RO Water TDS into the boxes above and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.

See our selection of TDS meters under Water Tests

SEE OUR ONLINE HELP GUIDE

Compare Products
  1. Remove This Item
Compare
Clear All
You have no items to compare.
My Cart

  1. ​

Filter Change Email Reminder

Filter Change Email Reminder
My Wish List
Last Added Items
  1. Add to Cart
    Remove This Item
Go to Wish List
You have no items in your wish list.