These are the greatest thing! We've always used lava rock & found it to be a pain to clean & care for. We do have a back yard pond & are using these Bio-Balls ~ they add to a much better filtration.
D. Morrison
Very good keeps the water flowing good ! Holds the waste from entering back in the pond. ! Easy to clean. ! Recommend those who have ponds to use it for the water falls
Paul p.
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