They do have a tool that cleans filters from the inside out. Your hose hooks into the base , the filter goes on this pipe with holes in it and when you turn on the water it forces it through the filter backwards. I will have to search my books to find it, I don't even remember what it was called. I will see if I can find it. I was thinking about it for my tubs I maintain, but was afraid I would get soaking wet in the winter with it which would not be good while going from tub to tub!
