You have to test your water to know if it’s pure.


What Are Total Dissolved Solids (TDS)?

“Dissolved solids” refer to any minerals, salts, metals, cations (positively charged ions) or anions (negatively charged ions) that are totally dissolved in your water and not visible to the naked eye. This includes anything present in water other than the pure water (H20) molecule.

Where Do Dissolved Solids Come From?

Some dissolved solids come from organic sources like plant matter, silt, plankton, and industrial waste and sewage. Other sources are runoff from urban areas, and fertilizers and pesticides from lawns and farming.

Others dissolved solids come from inorganic materials such as rocks and air. These may include 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 that have a positive or negative charge.

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

Why Should You Measure the TDS Level in Your Water?

The EPA advises a maximum contamination level 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 (arsenic, baruim, cadmium, copper, fluoride, lead, nitrate and others) may also be dissolved in the water.

The efficacy of water purification systems in removing
total dissolved solids will be reduced over time,
so it is highly recommended to monitor the
quality of a filter or membrane and
replace them when required.

How can water with high TDS be undesirable or harmful?

  • It may taste bitter, salty, or metallic and may have unpleasant odors
  • High TDS water is less thirst quenching.
  • High TDS interferes with the taste of foods and beverages, and makes them less desirable to consume.
  • For a truly great cup of coffee, proper TDS levels must be maintained.
  • Some of the individual mineral salts that make up TDS pose a variety of health hazards.

Even the best water purification systems on the market
require monitoring for TDS to ensure the filters
and/or membranes are effectively removing
unwanted particles and bacteria from your water.

Constantly test for TDS to check your Filter performance

If you have a filter or RO system in your home, you need to check the water it produces periodically to make sure it’s working properly. The performance of RO systems and filters are measured by the amount of TDS Reduced by the filters and membranes. The reduction of TDS indicates the reduction of microorganisms and harmful non-solids such as chlorine and fluorine.

So be sure to check the quality of your water every
month to make sure your carbon filters or RO
membranes are working well.