If it pulled enough vaccum, any minor air leak would becaome a major one, and possibly wouldn't show up under less vaccum.

That's my thought. I could be totally off base too!


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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).