Bought 2 to aerate a 2000 gallon pond. One worked out of the box while the other had to be nailed down to open. I think the factory glue sealed the intake. (That's the only reason I'm giving 4 stars.) The diffuser floats at one end as other reviews have stated. I was able to fix this by tying 3 ounce pyramid weights to the ends. The kit also includes a second attachment that allows you to force air from either end for a more even distribution. However, I have found that just one ending is sufficient. I use a commercial 50w (1110gph) air pump to power both 3ft cones at the same time with standard 25ft air hoses.
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