Need troubleshooting help

[Jacks mom]

I have algae in my pool for the third time this season. Each time I raise the chlorine level to SLAM level and maintain it until overnight chlorine loss is less than 1.

Each time, after passing the overnight chlorine loss test I let the chlorine drop to target level of 7 but when the chlorine drops to 8 or 9 the algae starts to grow again.

i am clearly doing something wrong. Any ideas?

I have been running the pump/filter for about 6 hrs a day (when NOT slamming, 24hrs/day during SLAMMING) could that cause algae?

FC 18 (goal. To bring it up to 22)
CC 0.5
CYA 55
PH 7.2

thank you

 

[tim5055]

Well, you say you pass OCLT, but what about the other two criteria? CC and is the water clear. The water being clear includes seeking anything "funky" like live/dead algae.

 

[Jacks mom]

Those are also fine. CC is 0.5 and pool is crystal clear.

Thanks.

 

[Jacks mom]

I am using my DPD test from last summer. The powder is a little blackish. Would that make it not accurate?

 

[Richard320]

Your experience is just another of a pattern I've noticed this year. The culprit: the pool light. Beneath ladder steps is another hiding spot. Think it's time to take back my pool... - Page 2

 

[Jacks mom]

Thanks! Will def check the light. I have been brushing behind the ladder.

 

[pooldv]

Check that Polaris too, or just take it out. My pool cleaner had algae inside it and has been banned from my pool for a month.

 

[kimkats]

You say you brushed behind but did you also brush the underside????

How about all around the skimmer face? I found some on the bottom you cannot see.

Get your pool it's own toothbrush.

Kim

 

[Jacks mom]

So I had the filter cleaned and it was green! I have also been more careful about brushing the ladder, I believe that May have been part of the problem.

Overnight chlorine loss was zero last night. The problem is that I ran out of r-0871 drops so I can't test the water. Is there some other way I can know when the chlorine is low enough to swim in.

I ordered some more but it won't arrive until thurs and I'm anxious to get the kids back in the pool

thanks

 

[Richard320]

So I had the filter cleaned and it was green! I have also been more careful about brushing the ladder, I believe that May have been part of the problem.

Overnight chlorine loss was zero last night. The problem is that I ran out of r-0871 drops so I can't test the water. Is there some other way I can know when the chlorine is low enough to swim in.

I ordered some more but it won't arrive until thurs and I'm anxious to get the kids back in the pool

thanks

It's safe to swim up to shock level. So if you weren't over shock level this morning, you also won't be when the kids want to get in. Using the chart "Chlorine Usage from UV" in Pool Water Chemistry it's safe to say you'll lose at least 1 ppm per hour FC in direct sunlight until FC gets below 10, when it will start to slow.