That's an interesting observation. If it's been windy it could be desert dust/sand settling. Dead algae is usually more of a dull white/grey color. Your gut is telling you something. To be safe, have you done an Overnight Chlorine Loss Test to rule out organics? You may say "no way" since the pressure doesn't seem to be increasing, but that's no guarantee at this point either.
No not a Hayward.
I did a oclt and no drop on ppm.
The only thing is I have an uneasy feeling about your test logs. Your FC has been on the low side a couple times at least, so then you add one gallon of chlorine which is 4 ppm worth. Then it may fall again. Consuming 4 ppm in 24 hrs is right at the high end of what we consider acceptable unless the CYA is too low or there is a lot of swimming or some explainable reason for consumption. May or may not be related to the brown, but just has me wondering even though you passed the OCLT.
Just since the pool was drained, acid washed, landscape done before refilling. They cleaned the pool before filling but made a good mess while doing all the work in and around it.I must say I'm a bit stumped.
I can't imagine the brown is anything related to pollen in your area. Has this been happening for a long time, or did it only start when those techs changed your sand? Anything unusual in your local area that might be related to that stuff? Landscaping work or something?
We'll watch for those results. If you pass again, we'll reach out to some others for ideas outside the box. Perhaps this is something residual from the maintenance done earlier to the shell. Can't imagine why, but we'll see.
Fwiw. I’ve been using the Home Depot hdx 10%chlorine. I have 2 gallons left then will be using the HASA 12.5% refillables which I think will be way more consistent and less volume of LC going in everyday.
HASA 12.5%
No sand returning to poolIf you over filled the sand filter you may have some of it get in to the pool. I have seen that once because ask me how I know
