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The Truth About Phosphates In Your Spa

Has your recent water analysis indicated that you have high phosphates in your spa water, but are not quite sure what it means? Phosphates are a contaminant that can be introduced to your spa water in many different ways: from soaps and detergents, through your source water, or from other elements in the environment that contain phosphates. When phosphates accumulate in a hot tub they can cause problems with water quality and clarity, and scaling that can cause equipment and surface damage. The risk of scaling and damage to equipment due to high phosphates is especially high with salt systems. If you suspect that your high phosphate level is coming from your source water, bring a sample of the source water as well so we can determine if that is the origin. You may need to add phosphate remover to your weekly chemical maintenance.

Luckily, SpaGuard makes it easy to remove phosphates from your spa water and keep them at a low level in the future.


Phosphate Remover

  • Helps protect equipment from calcium phosphate scale
  • Immediately reduces high levels of phosphate
  • Also used as a weekly treatment to keep phosphate levels within range
  • Ideal for use with salt spa systems



Treating for phosphates will temporarily cloud the water, so make sure you add it when you aren’t planning on using the hot tub and have some water clarifier on hand. It’s also a good idea to chemically clean your filters (just rinsing won’t be enough for this) before and after phosphate removal for the quickest results.



If you have scaling on the spa surfaces that you suspect are from phosphates, you can remove the scale deposits with Off The Wall.

Off The Wall® Surface Cleaner

  • Removes scale and hard water deposits along the water line
  • Compatible with spa water chemistry
  • Non-abrasive
  • Suitable for all spa surfaces
  • Can be used to clean entire surface of spa when unit is drained


As always, we recommend after the phosphate removal treatment that you bring another water sample in for us to test. Our water testing is always free, and it is important to retest to make sure your water is balanced and ready for your next soak. It is our goal to make your hot tubbing experience as enjoyable and stress-free as possible. After all, that’s why you got a hot tub in the first place, isn’t it?


Written by Advanced Spa And Pool