Moved from here.
I'm dealing with high CYA issues so I've been keeping the chlorine level high. Background - I'm not a newbie, but call me a rookie since this is my first year managing my wife's pool and I have posted previously. She had terrible problems last year with cloudy water, some green algae on pool bottom, and an inability to hold chlorine. She followed pool store methodologies and I convinced her to allow me to manage it this year. We started the year with Silkguard tablets but stopped using them a few weeks ago. The good news is the pool has been crystal clear this whole year and no apparent issues from high chlorine levels when swimming with FC levels up to 8.2.
Readings from today - FC 12, pH 7.6, TA 110, CH 280, CYA 100. We have been having a problem I saw discussed on the forums here - black gunk in the skimmer above the water line. We use floating duck thermometers and when they get sucked into the skimmer there is a black ring at surface level. I bumped the chlorine up because I noticed some black spots in a corner in the shallow end, they are now gone.
I assume that at least part of the reason why CYA is so high is use of Silkguard tabs from opening at end of April into July. Removing and replacing water is not a practical option - the alternative is keep FC high and do better next year (CYA was 50 at opening). So I think I have a handle on that.
What I'd like feedback on is the black gunk, if that is black algae. Lots of post on that here.
I'm dealing with high CYA issues so I've been keeping the chlorine level high. Background - I'm not a newbie, but call me a rookie since this is my first year managing my wife's pool and I have posted previously. She had terrible problems last year with cloudy water, some green algae on pool bottom, and an inability to hold chlorine. She followed pool store methodologies and I convinced her to allow me to manage it this year. We started the year with Silkguard tablets but stopped using them a few weeks ago. The good news is the pool has been crystal clear this whole year and no apparent issues from high chlorine levels when swimming with FC levels up to 8.2.
Readings from today - FC 12, pH 7.6, TA 110, CH 280, CYA 100. We have been having a problem I saw discussed on the forums here - black gunk in the skimmer above the water line. We use floating duck thermometers and when they get sucked into the skimmer there is a black ring at surface level. I bumped the chlorine up because I noticed some black spots in a corner in the shallow end, they are now gone.
I assume that at least part of the reason why CYA is so high is use of Silkguard tabs from opening at end of April into July. Removing and replacing water is not a practical option - the alternative is keep FC high and do better next year (CYA was 50 at opening). So I think I have a handle on that.
What I'd like feedback on is the black gunk, if that is black algae. Lots of post on that here.