Q: Our dealer instructed use to double shock because we had some algae. We did the first time with no ill effect. When the growth came back we double shocked again (2 weeks apart) and purple pool water. We usually shock our pool once a week and then e-z pool it the day after. These instructions were given to us by our dealer. Is this the correct practice or should we be doing something else. This is only the second year with the pool?
A: Generally purple water indicates a chemical reaction between copper and an electrical charge; the reaction was probably activated by the double shock. This is one reason why we do not typically encourage shocking pools using E-Z POOL, but that doesn’t mean the problem isn’t fixable. Once the chlorine dissipates from the water, so should the color, however to actually remove it, you need to remove the copper by using a metal remover. We do make one that is also a phosphate (algae food) and organics remover: our product is called REVIVE. However, this thought-process is only a guess, and without a current water sample, it’s difficult to troubleshoot. We do NOT want to give you any recommendations that will not solve, or worse — may complicate your current problem. Before moving forward, please take a current water sample to your dealer and have it tested. Please continue with your weekly chemical regime. We do recommend adding a chlorine tablet into the skimmer weekly instead of shocking. But either way you can finish out the season with shocking.
Q: We have been using E-Z POOL on more and more of our pools. However, this year upon spring openings we are noticing a LOT of purple pools with algae in them (including my own pool). What is this caused from?
A: Purple pools typically signify the presence of copper-cyanurate which from when copper and high amounts of cyanuric acid are in the same body of water and then oxidized (it takes high amounts) or when the pH gets high from some reason. The procedure that has worked best for pools like this has been to use Ascorbic or Citric acid product to treat the staining (if there is any staining) and then follow with a REVIVE treatment immediately after the stains are removed to prevent future stains. The other possible purple cause is oxidized manganese, this is typically a low percentage but can happen depending on fill water makeup. This can also be treated with REVIVE! but typically will take a double dose. Some consumers use RV Algaecide which contains manganese, this is typically a low percentage but can happen depending on fill water makeup. This can also be treated with REVIVE! but typically will take a double dose. Some consumers use RV Algaecide which contains manganese, when this comes in contact with chlorine pool water turns purple and it is very noticeable.