algae

[Prepooler]

I'm not sure if it is algae or not.We are having a deck built and it could be saw dust.We haven,t been in the pool in a week
but I test the water every day.FC has been 4.5 CC 0 PH 7.5.We have had alot rain .How can I tell if it is algae with out getting in?The water is crystal clear.THX

 

[Butterfly]

You can do the overnight FC loss test to rule out organics/algae.

 

[Prepooler]

How do I do an overnite FC loss test?

 

[TizMe]

Click on the words "overnight FC loss test" in Butterfly's post and it will take you to the pool school section with instructions how to perform it.