This is the best & easiest way to control algae in a large fishpond. Just pop them in & they do the work. The algae disappears & the rocks etc become cleaner (no black algae on them). Easy to know when to put them in, if you see the pond looking sad....reach for the algae blocks.
Verified purchase: Yes | Condition: New
I tried other products but so far this seems to be working well. Time will tell as I've only been using it for 2 weeks.
Verified purchase: Yes | Condition: New
Have always used these in the fish pond. Good value
Verified purchase: Yes | Condition: New
Excellent product, cleared my pond and also a 6' aquarium fish and water lilies not affected.
Verified purchase: Yes | Condition: New
Keeps my pond water clean and free of algae
Verified purchase: Yes | Condition: New
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