SeaKlear 90-Day Algae Prevention & Remover, 1 Qt

Product is very effective against algae.

So glad I tried this a few years ago, works great and it is the only algaecide I buy now

This is an awesome product which we've been using for years. One caveat is that you need to make sure that your pool is absolutely algae-free when you put this in. This is to prevent algae not to get rid of algae that's already there. And of course the rest of your chemicals need to be kept in line. You can't expect miracles but this stuff is great if you are good about maintaining your pool etc it's not a panacea though.

If you have black algae, this Copper based algaecide really helps - but it will not totally 100% eradicate the black algae by itself. After adding several quarts of copper algaecide and many pounds of the Chlorox shock w/ copper, I still had black algae on the floor of my pool - even though the water was perfectly crystal clear - in fact, this year my water is the clearest it has ever been! I found the solution to the black algae quite by accident. I bought a couple boxes of Trichlor shock. Trichlor has stabilizer in it so it dissolves much slower than Dichlor shock (and most "shock" is dichlor). The Trichlor is a bit cheaper - so I bought several boxes and figured it's give it a shot. WOW!! Instead of dissolving immediately, it falls to the bottom of the pool and just sits there....right on top of the black algae...and by the next day, the black algae is totally gone! I immediately started sprinkling the Trichlor shock on other areas of the floor where the black algae was growing -- and sure enough, bam! The next day it was gone. So in my experience, to get rid of black algae you need two things - Copper algaecide and Trichlor shock. Use the copper algaecide as directed on the bottle, and just be prepared to dump pound after pound of Trichlor shock evenly over the areas of black algae. You might need several treatments of the Trichlor, but believe me -- it does work.

This product works great to make the pool crystal clear.

I have used this product for 11 years. One bottle when I open the pool in the spring, one when I cover it up for winter. Easy application, you just pour it in around the pool plus in front of the jet and run the pump for a couple of hours. I have never had an algae problem. It is nice when a product does what is advertised, is consistent, and the price has remained relatively steady for years. I have recommended this product to several new pool users.

The product itself is good. It kills algae plus stops return. Most similar products only control start up. They won't kill existing algae. I Have ordered SeaKlear twice this season thru Amazon. Each time the lid was loose and was leaking product inside of package and on other products inside. I clicked the "how was your delivery" box as not good. Page disappears and no more follow up. I order a lot of products from Amazon, but am becoming unhappy about this and other things. AMAZON needs to up their quality for delivery and for 3rd party partners. P.S. my wife was very unhappy about blue stains on her floor! Be careful.

I just added this after bad storms with lots of rain. My pool looks clear and ready for swimming!