How do I lower Hardness?

To lower Hardness we recommend using Cal Treat if you have a D.E. Filter to remove hardness approx. 200-400ppm. Add 2.5 lbs (one bottle) of Cal Treat per 15,000 gallons.

Otherwise, if your source water is 300ppm less hard than your pool water, you can partially drain your pool (up to about 1/3 of the way down) and refill.

If your source water is also hard, consider balancing using the Hamilton Index to compensate for your hard water.

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  To lower Total Alkalinity we recommend using Easy Acid or - if not available - Sodium Bisulfate. This will lower the alkalinity strongly while keeping the pH relatively stable. We recommend you balance your Total Alkalinity according to your water ...

• I used Cal Treat and my hardness didn't change.

  Cal Treat may fail to lower calcium hardness in two scenarios: Cal Treat is formulated for D.E. filters only. If you used the product in cartridge or sand, there is no guarantee that it will pull the hardness out. You can try using filter aids in ...

• How does Cal Treat affect balancing?

  Cal Treat removes up to 400 ppm of calcium hardness. It's also slightly acidic and may lower pH.

• How do I raise Hardness?

  To raise Hardness we recommend using calcium hardness increaser (calcium chloride).  Assuming a 10,000 gallon pool, for every 10ppm increase in Hardness add 1.25 calcium chloride to pool.

• Does Cal Treat remove scale?

  Yes! Cal Treat can remove scale build up. However, if Cal Treat removes scale, it won't necessarily lower the hardness level. Rather, the scale removed will filter out, and the hardness level will stay relatively the same. You can repeat the ...