Algae maybe? Pics

[dfridal]

I'm keeping my water balanced. TA is a tad high at 100ppm. FC is kept at 7ppm and CC at 0.5 or below. CYA at 60. PH is perfect at 7.6.

This yellow/green stuff keeps showing up daily. Not everywhere, but under the steps, a couple places in the shallow end, and in 1 corner of the deep end. I brush it every day and it clouds up into the water but the water is still quite clear. I'm running the sand filter 12 hrs per day. I don't think it's pollen because we are past that season here.

How can it be algae if I keep my chlorine levels good? I'm stumped. Any advice would be much appreciated.

 

[PoolGate]

Have you tried just vacuuming it to waste?

 

[dfridal]

Yes. It just comes back in the same areas

 

[reggiehammond]

Algae can get a foot hold, and then be knocked back slightly. Since you appear to be using liquid chlorine, your FC levels are rising and falling between additions. During the lower points of FC level, algae grows a little. You raise FC, you knock it back a bit.

You need to complete a Overnight Chlorine Loss Test to see if you have algae. Raise your FC to 10ppm for the OCLT, test level after sun is off pool completely, test again before sunlight returns. It's an easy test to confirm if you need to SLAM Process.

 

[dfridal]

That makes sense. The water is very warm right now as well which doesn't help matters. I'll keep adding the daily chlorine and do the OCLT on Friday when another weekend rolls around. Thanks for the input!

 

[duraleigh]

What Reggie said. Very likely that what you are seeing is dead algae each day meaning you still have some live algae. The OCLT test should tell us if a SLAM is in order.