If your pool has had shock treatment to remove algae what could be another cause of a green pool?

Answer 1

It could still be yellow or mustard algae. Chlorine is not always the only antidote to an algae bloom. You must use an algaecide, as well. Copper- and silver-based varieties are effective. When the algae is dead and sinks to the bottom, it may appear grayish in color. Vacuum that out to waste. If the green stuff is only on the bottom and not forming on the ladder, skimmer parts, walls, etc., perhaps you don't have an algae problem. Perhaps you have a calcium problem. Does the greenish stuff "poof" and easily disperse when you disturb it with the vacuum head or a brush attachment? Is the water generally clear except for the ick at the bottom? If so, it could be calcium buildup. If you use a calcium-based chlorine product and have been doing so awhile, then it's quite possible your problem is calcium. You need to very carefully vacuum that precipitate out to waste, replace the water you ejected with fresh water, and switch to a non-calcium-based product. The answer above neglected to mention an important part of the pool - THE FILTER. Without the proper length of filter run time you will get nowhere in having a clear, quality pool.

Answer 2

Green algae can be caused by a number of things. You may not be paying enough attention to filters and to water testing. Clean or renew filters first, test the water, then establish a proper Ph ( 7.0 -7.2 ) Then chlorinate. That should do it for a start.

Answer 3

Hest