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Total Dissolved Solids (TDS) Reduction

Product Description

What is TDS and What Does It Affect?

TDS, or Total Dissolved Solids, is a measure of the amount of salts or dissolved ions in water.  It is the weight of remaining salts after the water has been filtered or evaporated, measured in mg/l, which is equivalent to ppm or parts per million. The lower the level of TDS, the purer your water is. Salt is composed of ionic compounds, both positive and negative ions creating a neutral product (no net charge).  As a rough rule, multiplying the conductivity by 0.65 is approximately equal to the TDS.  Conductivity measures a current passed through the water, the higher the TDS or ions in the water, the more conductive.  TDS varies from 50-45,000 ppm, depending on the water source.  Standard seawater is around 36,000 ppm, depending on the region. Higher TDS levels of around 45,000 ppm are seen in the Persian Gulf.  As a rule of thumb, 10 PSI per 1,000 ppm of TDS contributes 10 PSI of osmotic pressure.  Therefore, the higher the TDS, the higher pressure required to overcome the osmotic pressure, hence the name Reverse Osmosis.

How can I lower TDS in my water?

In order to find out your level of total dissolved solids, the first step is to have your water tested by a local water treatment laboratory. Once your TDS level has been determined, a Pure Aqua representative can help you to determine your treatment options.

There are a few treatment options to reduce TDS such as reverse osmosis system, filters, and softeners. Reverse osmosis is considered to be one of the best available solutions to reduce the total dissolved solids and to meet many treated water quality requirements. Reverse Osmosis removes dissolved ions (salts), where rejection is 99%+ depending on the membrane and specific ions. The WHO guideline for drinking water is 500 ppm. 

The reverse osmosis (RO) process works by pushing water through a semipermeable membrane under pressure to remove the contaminants. Some contaminants treated by reverse osmosis include chloride, colloids, fluoride, organics, particles, pyrogens, and sodium.

Pure Aqua specializes in reverse osmosis and nanofiltration technology. Learn more about Pure Aqua’s standard line of packaged RO equipment.



It is important to frequently test water for TDS. One major benefit of reducing or treating TDS is that it will influence the taste in drinking water. If the TDS level is too low the water can have a flat taste and water with high levels of TDS could have a bitter, metallic, or salty taste or may carry chloramines, chlorine, etc. Therefore, the goal is to have a moderate level of TDS to give drinking water a pleasant taste as well as to eliminate harmful chemicals. Once an adequate TDS level has been reached, the treated water can be used for a wide range of applications. TDS levels can have an impact on human health, aquariums, pools/spas, etc.



  • Aquaculture
  • Drinking Water
  • Boiler feed water treatment
  • Pharmaceutical
  • Food and beverage
  • Semiconductor
  • Metal Finishing
  • Power Plants
  • Ion Exchange Pretreatment




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Product Videos
RO Reverse Osmosis & Water Treatment | Industrial & Commercial - Pure Aqua, Inc. 06:46

Pure Aqua, Inc. is specialized in designing & manufacturing commercial & industrial reverse osmosis (RO) water treatment and purification systems. Our engineers design & build customized water treatment & purification systems including water softeners, waste water treatment, RO water filtration, UV water purification, reverse osmosis plants, brackish & tap water reverse osmosis systems, sea water reverse osmosis systems, nanofiltration systems, ultrafiltration systems, RO cleaning skids, cartridge filters housing, deionizers, containerized equipment, electrodeionization units, UV sterilizers, and chemical dosing. All our systems are engineered & manufactured in The USA. For more information, please visit the following pages: - Water Treatment Products: - Seawater RO Systems: - Industrial reverse osmosis systems: - Brackish Water Reverse Osmosis Systems BWRO - Industrial & Commercial:

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