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I took the NCMA testing a yyear or so ago, and they said not to put socked tile behind walls because of the limestone (typ) drain rock getting washed off and 'caking' up the sock.
Why can't you put in two, one with and one without and get back to us.......He could be our test site..... I can see it now....
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Sculpting nature with the help of its Creator
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