How can this be?

[Dan P]

I did a SLAM about 2 months ago and have been letting chlorine levels taper off. This morning I was doing my daily ph and chlorine test, chlorine was dark yellow and noticed some yellow spots on the corner of the steps. I brushed it and came right off. I then did the DPD test and was at 12. Question is how can I have what appeared to be algea when chlorine level is at 12? Running pump from 6:00 am to 8:00 pm. Help please.

CL: 12
PH: 7.5
CC: 0
CYA: 70

 

[JVTrain]

If you have inadequate circulation in an area, this can happen but at that FC, it would be less likely. How often are you brushing the pool? Is your Kreepy getting into that area? Regular brushing, especially in areas that do not get attention from a robot or cleaner is important.

 

[Dan P]

Brush once a week, Kreepy doesn't get there. The return lines are pointed away from the steps. Might have to brush more often as it might be poor circulation.

 

[ping]

Keep an eye on it and if it continues to return let us know. Is that area in a shady part of the pool?

 

[Dan P]

No, it gets sun but less now because of the season and arc of the sun. Water temp at 76, don't know if that makes a difference. Thanks.

 

[Casey]

I agree with the others. Any dead spots will accumulate more dirt and a film. Brushing more often always helps.