I am collecting the stuff I need to redo my pond's waterfall & I thought I should add 1 or 2 settling tanks. Does anyone know where I can buy a clean 55 gal drum? I was thinking of adding 2 of them so I can split the return coming from my MAG 36 into the 2 drums then into the waterfall. My thought was using 1 or 2 of these would be cheap plus I could get the flow low enough that the tanks would work