I have a friend and their pool turned green a month or so ago. So I got them to buy the same test kit that I have. They sent me their results and I told them what to do. I had them SLAM the pool which turned out successful. Clear water and everything was fine. A couple of weeks later, the same thing happened. When I got their results, their FC was almost gone and their CYA was really low. So I told them to get the FC up and CYA up and everything was fine again. They tell me that their water clears up very soon after adding bleach in each of these scenarios.
Well, I heard from them again this week and the same thing has happened again. I looked at the test results and told them what to add. Today I heard back and they said the water wasn't green any more but it was cloudy now....can't see the bottom of the deep end. I asked for the test results are this is what I got:
FC 2 (after adding 5 gallons in 4 days)
salt 800 (this was after they had added 300lb). This doesn't make sense so I asked what strips she was using and they could possibly be reading them wrong.
What could the issue be? It's a salt water pool with about 30k gallons. Every time I hear from them, their FC is very low..like 0-2 usually. When this first started, they had their salt generator replaced because it wasn't working. Something is eating up their FC. Could it be algae living behind the light or something? Do you think the newly replaced SWG could be having problems still? I've told them about everything I know as far as the chemicals go. It's starting to get over my head at this point.