hi, im thinking of making a diy canister filter for my 180 gallon. I found these light blue 14 gallon barrels off ebay that I want to use. they say they are for beer fermenting. they have a clamp wring that goes around the lid and clamps the gasket inside the lid. they are air and water tight. the pump will be In the filter causing a negative pressure in the barrel. do you think these will hold up? sorry the thing wont let me post a link for some reason. go on ebay an look up 14 gallon barrel. click the one that matches my description.