Now if you are having troubles getting it clear now that it's very blue, just cloudy, here are a couple of things you can tryl--it's spring so you may have pollen, too.
1) "Skimmer Socks". There are several brands of products similar to the one called this, but it doesn't matter. You put this thing in your skimmer basket with the elastic around the edge and you won't BELIEVE how much junk it pulls out! I rinse 'em out and one usually lasts me about a month, but they are pretty cheap--4- 6 in a pack and less than $10
2) DE powder in your sand filter. Sounds crazy but many members and Poconos and I do it all the time. I think Watermom does too. aylad doesn't because she uses Zeosand. Buy the smallest box of DE you can--10lbs or less. Just after you backwash, add 1/4 to 1/3 cup through your skimmer (take out the skimmer sock first!). Wait 10-20 minutes and see if your pump pressure increases--you want it to rise around 1 lb. Much more and your flow will decrease. If you put in too much, just back wash. The DE will significantly improve a sand filter's filtering and it's really cheap! My last box cost $8 and I've been using it since last season. The box before lasted about 3 seasons, too.
3) Add some Polyquat algaecide--the ONLY one we recommend. It's better for prevention than curing algae. You'll recognize it no matter what the pool store calls it because it will be the ONLY ingredient and say "Poly....<something-something> 60%. Sometimes it's called Black Algaecide, sometimes Mustard Algaecide, I never know! I go by the ingredient. What's great about Polyquat is it doubles as ANOTHER chemical (so you don't have to buy that, too) called a "flocculent". Floc helps cloudy suspensions clump so you can vacuum them and so the filter catches them. I avoid 30% and never pay more than $20/quart.
These are easy and simple and they usually work!
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