HTH 67084 Pool Care Algae Guard Advanced, All Algae Eliminator for Swimming Pools - Fast-Acting, Destroys & Prevents Green, Black & Mustard Algae, Keeps Pool Water Crystal Clear, 32 fl oz

Crystal blue pool but noticed a few stubborn black algae spots show up. Tried a couple different products with no results. Algae got worse.Had to use the whole bottle, two different treatments a couple days apart but it worked perfectly. Now I can finish getting the pool swim ready.

Ive been using this all summer to help keep the algae out of the pool. Water is crystal clear.

This Product Keeps Our Huge Above Ground Saltwater Pool Crystal Clear And The Water Smells Great After Treatment

The algieside works great, we have an above ground pool.We've been getting alot of rain, works great

Won’t use any other product. I have an older pool & the plaster was looking like it was getting a green tint to it, I have redwood trees around it and I thought maybe I was seeing shadows of the trees making it look like a green tint as well. WRONG this product made the water & plaster so clear. Clearer than I’ve seen it in years, it actually looks blue again!A must buy……

Why did you pick this product vs others?:This truly helped when I had lost hope and really thought there was no coming back for my pool. I plan to use it once a month for maintenance

My experience has been that this product works for 3-4 months minimum per application, which is awesome in my opinion. If it's not working like that, your have other issues with the chemistry in your pool that you need to address first. I also, unfortunately, know this from experience. Get your total alkalinty, calcium hardness, and chlorine stabilizer levels right and this stuff will work for ages. I've had a week here and there where I was lazy about chlorine, and it dropped pretty low but I still didn't get ANY algae, which was an issue before I started using this stuff.This review is specifically for HTH 67289 (the "Ultra", not the "Advanced") which contains copper sulfate, the magic ingredient.

The mustard algae grew fast after entering the summer time, it's highly pool shock and chlorine resistant, just give this product a shot. It worked! Used it with the clarifier according to the instruction, just needs 4-5 days my beautiful pool came back!