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What is TDS (Total Dissolved Solids)?  Where does it come from, why is it important  and how to treat it?

(TDS) Total Dissolved Solids are the total weight of all solids that are dissolved in a given volume of water, expressed in units of mg per unit volume of water (mg/L), also referred to as parts per million (PPM).
 

Questions and Answers about TDS in your water:

What are Total Dissolved Solids?
Where do Dissolved Solids come from?
Why should you measure the TDS levels in your water?
How do you reduce or remove the TDS in your water?
How do I check Reverse Osmosis membrane performance with this TDS meter?

What Are Total Dissolved Solids - TDS?
 
1. "Dissolved solids" refer to any minerals, salts, metals, cations or anions dissolved in water. This includes anything present in water other than the pure water (H20) molecule and suspended solids. (Suspended solids are any particles/substances that are neither dissolved nor settled in the water, such as wood pulp.)
 

2. In general, the total dissolved solids concentration is the sum of the cations (positively charged) and anions (negatively charged) ions in the water.
 

3. Parts per Million (ppm) is the weight-to-weight ratio of any ion to water.
 

4. Conductivity is usually about 100 times the total cations or anions expressed as equivalents. Total dissolved solids (TDS) in ppm usually ranges from 0.5 to 1.0 times the electrical conductivity.
 

Where do Dissolved Solids come from?
 

1. Some dissolved solids come from organic sources such as leaves, silt, plankton, and industrial waste and sewage. Other sources come from runoff from urban areas, road salts used on street during the winter, and fertilizers and pesticides used on lawns and farms.

2. Dissolved solids also come from inorganic materials such as rocks and air that may contain calcium bicarbonate, nitrogen, iron phosphorous, sulfur, and other minerals. Many of these materials form salts, which are compounds that contain both a metal and a nonmetal. Salts usually dissolve in water forming ions. Ions are particles that have a positive or negative charge.

3. Water may also pick up metals such as lead or copper as they travel through pipes used to distribute water to consumers.

Why Should You Measure the TDS level in your Water?
 

The EPA Secondary Regulations advise a maximum contamination level (MCL) of 500mg/liter (500 parts per million (ppm)) for TDS. Numerous water supplies exceed this level. When TDS levels exceed 1000mg/L it is generally considered unfit for human consumption. A high level of TDS is an indicator of potential concerns, and warrants further investigation. Most often, high levels of TDS are caused by the presence of potassium, chlorides and sodium. These ions have little or no short-term effects, but toxic ions (lead arsenic, cadmium, nitrate and others) may also be dissolved in the water.
 

The following are reasons why it is helpful to constantly test for TDS:
 

Taste/Health High TDS results in undesirable taste which could be salty, bitter, or metallic. It could also indicate the presence of toxic minerals. The EPA's recommended maximum of TDS in water is 500mg/L (500ppm).
 
Filter performance Test your water to make sure the filter system has a high rejection rate and know when to change your filter (or membrane) cartridges.
 
Hardness High TDS indicates Hard water, which causes scale buildup in pipes and valves, inhibiting performance.
 
Aquaculture A constant level of minerals is necessary for aquatic life. The water in an aquarium should have the same levels of TDS and pH as the fish and reef's original habitat.
 
Hydroponics TDS is the best measurement of the nutrient concentration in a hydroponics' solution.
 
Pools and Spas TDS levels must be monitored to prevent maintenance problems.
 
Commercial/Industrial High TDS levels could impede the functions of certain applications.

 


Ideal Drinking water from reverse osmosis, distillation, deionization, microfiltration, etc..


0-50 PPM


Often considered acceptable range for carbon filtration, mountain springs or aquifers.


50-140 PPM


Average tap water.


140-400 PPM


Hard water.


170 PPM or above


Less desirable


200-300 PPM


Unpleasant levels from tap water, aquifers or mountain springs.


300-500 PPM


The EPA's maximum contamination level.


500 PPM

 
How do you reduce or remove the TDS in your water?
 

1. Carbon Filters   (very slight reduction)

2. Reverse Osmosis (R.O.)  (extremely high reduction and great tasting water )

3. Distillation   (total reduction - flat taste)

4. DI Deionization  (usually a final polishing filter following a RO Reverse Osmosis filtration system to eliminate TDS)

TDS Meters are simple to use to check Reverse Osmosis membrane performance.  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. Anyone that wants to know about the quality of their water should have one of these TDS Meter Testers.

 


Membrane TDS Rejection Percentage Calculator
 


 Enter Supply
 Feed TDS
 

 

 Enter RO Permeate
 TDS
 
 


  Your Membrane Rejection Rate:
 


  (This indicates your membrane's performance.  Replace the RO membrane once the rejection rate falls below 80%) 

 


Order your TDS water quality tester now.
 

TDS Meter - Tester To Test For Total Disolved Solids In Water


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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.

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COM-100 WATERPROOF EC / TDS / TEMP COMBO METER
 


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WATERPROOF EC / TDS / TEMP COMBO METER / PROFESSIONAL TESTER - COM-100

FOR THE PROFESSIONAL ! ------ COMBO METER / TESTER FOR EC / TDS / TEMP - WATERPROOF. Measures electrical conductivity (EC), total dissolved solids (TDS) and temperature. Three different calibration options (KCl, 442TM, NaCl), each with its own non-linear conversion factor. Automatic Temperature Compensation (ATC) using three temperature coefficients. Waterproof housing. Measurement Range = 0-9990 S; 0-8560 ppm (auto-ranging). Digital Calibration (push button) Auto-off function, data-hold function and low-battery indicator. Large display and easy-to-read LCD screen includes simultaneous temperature reading. Factory Calibrated: The COM-100 meter is calibrated with a 1413 S solution. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver. Includes a cap & batteries. -------------------------------------------------------------------------------- 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. SPECIFICATIONS EC Range: 0 - 9990 S TDS Range: 0-8560 ppm (mg/L) Temperature Range: 0-80 C; 32-176 F Resolution: 0-99: 0.1 S/ppm; 100-999: 1 S/ppm; 1000-9990: 10 S/ppm. Temp. resolution is 0.1 C/F Accuracy: +/- 2% EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, set by the user. Calibration: Digital calibration by push button. Probe: Detachable platinum electrodes Housing: Waterproof (submersible) Power source: 3 x 1.5V button cell batteries (included) Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches) Weight without case: 90.7g (3.2 oz)

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COM-100 Owner's Guide

TDS Meter - Easily Installs Inline - Very Simple To Use
 

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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!

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TDS Meter Dual Mode Readings - Professional Grade - Easily Installs Inline - Very Simple To Use


TDS Meter Dual Mode Readings - Professional Grade - Easily Installs Inline - Very Simple To Use


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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. From 1000 to 9990 ppm, the resolution is in 10 ppm increments, indicated by a blinking 'x10' image. Factory calibrated meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. Comes equipped with 1/4 inch John Guest Quick-Connect T-fittings as shown. Also available with 3/8" fittings. Installs quickly and easily. Differences from the DM-1: Designed for commercial/industrial applications. Stronger, water-resistant casing. Improved design, including an extra large, easy-to-read LCD display. Longer, waterproof, shielded cables. Variable mounting bracket. SPECIFICATIONS: Range: 0-9990 ppm Accuracy: 2% Cable Length: 46" (including sensor) Power source: 2 AAA batteries (included) Battery life: over 1000 hours of continuous use Size: 11.6 x 6.8 x1.8 cm (4.6 x 2.6 x .7in.) Weight: 201.3 g (7.1 oz.) 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.

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Hanna  TDS Calibration Solution Packet # 70032
 

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Hanna TDS Calibration Solution Packet # 70032

Hanna TDS Cailbration Solution 1382 PPM for calibrating TDS Meters / Testers to use for testing Reverse Osmosis RO Systems. # 70032


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