What is Total Dissolved Solids?
Total Dissolved Solids or TDS refer to any salts, metals, minerals or cations that are dissolved in water. With swimming pools, calcium, magnesium, chlorides, and salts as well as other organic matter makeup TDS that are dissolved in water.
How will I know my pool has high levels of TDS?
Calcium Scaling on Tiles

Calcium Scaling on Tiles

Even when your chemistry is in range, the following can summarize warning signs that your TDS may be high:

  • Cloudy pool water
  • Staining on pool surfaces
  • Scaling on tiles (see image)
  • Hard water
  • Salty taste of the water
  • Algae blooms (see image above)
  • Ability of chlorine to sanitize

How do I test high TDS levels in my pool water?
TDS meter

TDS meter

You will want to use a TDS meter to test the water. These meters measure the electroconductivity of the water.

If TDS is high, a water change will be necessary.

How can I lower the TDS level in my pool water?

When TDS levels are too high in a swimming pool it is recommended to drain the pool.

Any time you remove water from a swimming pool you run the risk of ruining the interior finish.Reverse Osmosis (RO) filtration lowers TDS levels and is by far the most effective way as the water levels in the swimming pool don't change.

Why drain your pool water?

That is indeed a good question. There are 2 reasons:

  1. If you live in areas where calcium hardness levels are high coming out of the tap, a water change is typically recommended every 2-3 years.
  2. Because the calcium hardness, TDS, or cyanuric acid levels are very high.

But why drain your water and waste it when you can recycle it, right? With Reverse Osmosis (RO) filtration you can lower TDS, calcium hardness and cyanuric acids without draining your pool!

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