Applied Biochemist Black Algaetrine Algaecide (1 qt) - 2 Pack

I was hesitant about this product as I've tried other similar products but it worked perfectly. I had stubborn black algae on the bottom of my pool that would not come off with a brush. Added this product to the pool and within a few days. Black spots gone.

This stuff works. I had tried everything including scrubbing with steel wire brush. Yes it does foam but I’ll take a little foam over hundreds of black spots on the bottom of my pool or hours of scrubbing with a brush. It has taken about a week but the spots are 98% gone.

We had a minor black algae issue in our gunite pool (a few spots here and there). We scrubbed the spots and other areas with a stainless steel wire brush, brushed the entire pool with stiff bristled brushes, triple shocked it then waited 2 days to add this algaecide. First, this product has a substantial odor. It actually smells like dish soap or children's bubbles... even after adding to over 30,000 gallons of water, the pool water smelled. Secondly... it FOAMS! We used less than half of the recommended dose. We checked PH, Alkalinity, etc. to make sure that wasn't an issue and all levels were good, so that was not a culprit. We turned the water features on the next day and it looked like a bubble bath where there was moving water. It wasn't horrible but it was pretty bad. I could smell the odor for nearly a week. The odor has now dissipated, but it has been over a week and we are still seeing foam. It seems to have worked (or at least helped) = no algae spots, but it is definitely not non-foaming. As far as functionality goes, so far... it seems to be effective. If you can live with foam and soapy odor, I'd give this a shot. Also - our pool is salt water, so I'm not sure if that contributed to the foaming?As a follow-up - after about 10 days, the foam and the odor subsided. The pool looks great. I'm satisfied with the product and the results, but was disappointed in the foam and odor that persisted for well over a week.

I bought this chemical thinking I could clear up some black mold spots inside my pool. It just didn't work for me. I'm not blaming the chemical product, I'm sure it probably works in the right hands and knowledge, it just not for a person like myself who is outside his depth of knowledge. Gonna leave this issue to to pool pros.

Amazing!! The only product I have used to get rid of mold and to maintain weekly to keep away!Heavy shock , put in product , soak pool tools in it to remove , bleach floats, scrub daily until gone,Then maintenance as directed weekly . Took care ofEntire summer! Will never be without this product ever again!

I have tried many many other chemicals that claimed to get rid of black algae. None of them delivered until this product. Extremely happy! Finally got my pool spot free. I'm sorry I did not take before pictured; I honestly didn't think it would. I followed directions. Balanced all my ph, alk, chlorine, etc. Scrubbed ( for about and hour) with wire brush. I added 4 ounces of product. Cleaned my filters and ran the pump for 8 hours. Next morning, perfect. The pictures are the end result. Wish I had known about this product sooner. Thank you thank you thank you!!Of note: there are still a few spots left, those should be easy to scrub off, not like before.

Within 48 hours, my black algae was gone. Not much more to say.... the product works... and works well!

Did not work