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  1. H

    Deep sump

    i know very much about the VGB act
  2. H

    Deep sump

    As far as I know the deeper the sump is the more the suction is dispersed
  3. H

    Deep sump

    Hi everyone. I had an idea for a new main drain sump what if it was deep say 13 inches would this help stop suction entrapment any answers are would be helpful thanks regards hugo