Place a hand filled with drywall screws in to the tank and shake them about vigorously for numerous minutes. These will dislodge any loose particles of rust. In the situation of Fiberglass and plastic tanks, this may rough up the tank inside, increasing adhesion. But, that is also want would https://caswellengineering35677.shoutmyblog.com/36429184/top-cibse-approved-cpd-secrets