Clorox Pool&Spa XtraBlue+ Algaecide Form Pool Algae Chemical Controllers for Treating Algae, 40 oz

Kills algae and prevents new growth. Pour in slow or in front of one of the running jets so the blue color from the product doesn't cause discoloration on your pool walls/floor.

I have mustard algae and used it last year but didn't follow the directions so it came back. this year, I followed the directions and repeated in 72 hours. the pool is crystal clear. no sign of algae.

I use this product every year --it's expensive, but Walmart is always at least ~$1 cheaper than Lowes, and much, much cheaper than the pool supply store.

This is the best algaecide you'll ever use. Three other products did not fix my algae problem. I tried this product, following the directions to a tee. It worked as promised. Within 15 hours of application, my pool was clear blue.

This product worked as advertised. Followed the directions and it eliminated what I believe to be black algae. I did scrub my gunite pool first with a stiff metal pool brush. Then vacuumed to waste for the next several days. Four weeks later pool remains algae free.

Seems to work better than most others I have used over the past 22 years.

It didn't get rid of the algae,I follow the directions, But it didn't get rid of the black algae. Still need help.

The small bit of algae died but this left a stain in the bottom of our small pool. It is a 14ft across pool we take down each year and it's been nice and blue for 3 years but now it has brown stains scattered across the bottom. I couldn't get the usual algaecide I use because of the time of year so I tried this. I regret it.

Fine another brand Clorox pool items are just to keep u buying kore and kore products it's a never ending cycle wasted over $300 and still ended up draining the pool

Didn't change the pool at all