The Planted Tank Forum - View Single Post - My Review: SunSun "Outside Filter" HW-302
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post #606 of (permalink) Old 04-28-2012, 06:20 AM
Join Date: Apr 2012
Location: cincinnati,ohio
Posts: 1
There is a clear round piece in the return side with a flapper on it. Does it need to stay in or be taken out?
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