Horrible product. I put in the recommended amount and my pool turned into a sea of foam. Still after 2 weeks I had so much foam, I had to invest in de-foaming products just to get rid of some of the foam. If I wasn't in rain parched California, I would have drained my pool, but with the drought, that wasn't an option. I will give it 2 stars, because it did seem to get rid of most of the algae.

THIS PRODUCT CREATES A NIGHTMARE! SEE PICTURES! I don't typically write reviews but if I can save someone the headache. The foam and smell will not go away. It has been almost a week. We have removed all foam by buckets for days and it still comes back!

Economic in value, especially compared to Leslie's Algaecide. However, don't follow the initial values for new pools. You will have foam for days! Don't put it into the spa separately because if you do . . . it will generate foam that will bubble out of the spa when you turn the air jet on. Know the volume of your pool. Then whatever the recommended amount to add, add 75% of that. That way, you'll somewhat control the foaming.

This product works better than any I have used in the past

Used this product for years. Works well.

Great product for an even better price!

Works great to help keep algae under control

No nasty green stuff in my pool

Good 40% algaecide with no copper

Great product that is reasonably priced