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well. u can put a plastic/stainless steel screen in on the out going side of the check valve. also i have my return on the inside of the tank elevated abut 2.5 inches off the bottom and can raise it higher if needed after the sand bed is in place. i have the same concern as u and have been realy trhing to thing of a way. and it windo mesh screen my be the only way. it might get clogged out flowing but u can easly clean it by. i'm working on an idea as i type this and will post the results of it as soon as i build and test it.
thanks for the concern and idea. most people tell me there will be a problem with the check valve but never tell me why.
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