CrystalClear Sparkle Fountain & Water Feature Cleaner - 1 Gallon Treats Up to 1,280 Gallons

I am very happy with the results. Our fountain had a lot of algae and slime, after cleaning the fountain well, we added this product to the fresh water and it has remained clear for weeks. We only need to add additional product every 1 1/2 to 2 weeks and it has stayed amazingly clear.

Water crystal clear and feel good about birds

Seemed to work ok on my outdoor fountain. Might try something else because I know nothing about outdoor fountains.

Does a great job keeping the water clear. It does not seem to address algae

I read all the great reviews and tried it with our 3 tiered fountain in So Cal because I keep having an algae problem in the hot weather. 80-99 degrees. Started from scratch with a clean fountain and fresh water. Used more than enough and kept refreshing it .Crystal Clear did absolutely nothing. Algae came right back & ended up being a complete waste of money. Disappointing.

We use this in our fountain. It holds 10 gallons and we refill it about every 3rd day when it's hot. Since using this, the water stays crystal clear with no algae. Very happy with this product.

My fountain has remained crystal clear for 2 weeks now. And it has been over 100 degrees every day which is when it usually gets green. Very impressed. A little expensive so don't spill a drop

A cup and a half keeps my waterfall clean for well over a week - even in hot weather.