Jardin Ball Style Aquarium Fish Tank Pump Air Stone Airstone

I purchased two of these and they do not work! I put them in the pond and no bubbles came out. I put back my older air stones.

This sphere is being used dwc,it has a fairly good turbulance effect i hope to see a diff in growth,6 mos is all i get out of them,they seem to loose effect. The product itself seems to be a cinerated metal fairly heavy will see.

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