Algae returning to pool?

[maddog99705]

Moved from here.....

I replaced the sand in our filter 4 or 5 months ago and it has been fine. We had a hurricane and power was out for a month. Trying to clean the pool now and algae is coming right back into the pool from the filter. When I backwash there is not a lot of color change verifying the sand is not catching much. I took the sand out to check the pipe and stuff, put the sand back in and when I backwashed it was like mud water coming our for a minute or so. Still the green goes right through the filter back into the pool. Do I just need to buy new sand already?

 

[mknauss]

Welcome to the forum! :handshake:

Clearing the pool of algae is a chemistry problem, not a filtering problem.

How do you test your pool water chemistry?

I suggest you read Pool School - ABCs of Pool Water Chemistry and consider reviewing the entire Trouble Free Pool School book.

 

[Jimrahbe]

99705,

Welcome to TFP... A great place to learn how to turn a green pool blue... (There is song like that somewhere???)...

Chemicals keep algae out of your pool not the filter. Filters are designed to capture the stuff that falls into your pool.

My guess is that your CYA is above 80 and your Free Chlorine level is less than 2 ppm.

While you may need a new filter for some other reason, you don't need a new one because it won't turn your green pool blue.

Take a look at our Pool School and you will see what I mean... Pool School - Pool School

Thanks,

Jim R.