Hello,
Some backstory: I've been battling an issue with brownish colored spots showing up on bottom of pool. At first I thought it was yellow algae but then reading more about it it didn't meet all the criteria. It grows all over including areas in the sun, not on the walls, and different overnight tests I did never showed a chlorine loss over 1.
Well, I stopped cleaning for like a week and the walls started to get gunk on them. This was mainly on the corners where the floor and wall meet. I was trying to maintain chlorine but there was a moment where chlorine dropped to around 2, maybe lower, at a CYA level of 30 (I only used the liquid drop test in this moment so don't have exact measurement). So it is completely possible it was an unrelated algae bloom but could also be that since I wasn't cleaning regularly it allowed the yellow to spread? When slamming that away I decided to just try slamming for the brown spots in case they are algae.
Back to my question: Right away the wall gunk was resolved but I still have brown spots 2 weeks later. There's maybe a slight improvement in the amount but that could also just be from the daily brushing and vacuuming. My understanding is that visible algae being gone is one of the requirements to stop the SLAM but yellow algae requires a higher level of shock for 24 hours.
Should the yellow algae be gone during the normal SLAM process prior to the 24 hour shock? Or should I complete all the steps except the visible algae part and then do the 24 hour shock?
Some backstory: I've been battling an issue with brownish colored spots showing up on bottom of pool. At first I thought it was yellow algae but then reading more about it it didn't meet all the criteria. It grows all over including areas in the sun, not on the walls, and different overnight tests I did never showed a chlorine loss over 1.
Well, I stopped cleaning for like a week and the walls started to get gunk on them. This was mainly on the corners where the floor and wall meet. I was trying to maintain chlorine but there was a moment where chlorine dropped to around 2, maybe lower, at a CYA level of 30 (I only used the liquid drop test in this moment so don't have exact measurement). So it is completely possible it was an unrelated algae bloom but could also be that since I wasn't cleaning regularly it allowed the yellow to spread? When slamming that away I decided to just try slamming for the brown spots in case they are algae.
Back to my question: Right away the wall gunk was resolved but I still have brown spots 2 weeks later. There's maybe a slight improvement in the amount but that could also just be from the daily brushing and vacuuming. My understanding is that visible algae being gone is one of the requirements to stop the SLAM but yellow algae requires a higher level of shock for 24 hours.
Should the yellow algae be gone during the normal SLAM process prior to the 24 hour shock? Or should I complete all the steps except the visible algae part and then do the 24 hour shock?