The lady that I bought this stuff from purchased it sight unseen at an auction. It was in a storage facility and the previous people didn't pay the rent. She took pictures and a brief inventory. And do I mean brief. She stated that there were over 100 ten gallon tanks. There were 156 and all of them are already drilled. I still haven't gone through all of it. There is stuff that I have no idea what it is. Anyone ever hear of a fluidized sand filter?