I don't see the need for the extra money for a gadget, that I see I do not need. I made and use a basket type filter in the second chamber. It is a basket type design that all the water from 1st chamber flows into. It has section for stuff from top to bottom. Top section felt pads,easy to lift off and replace, then sponge section, then carbon bags or whatever I want to put in there. No need for reactors or extra electricity cost. Easy no mess, simple to change. I do not mind spending time to do a change out. I see why people would love the rollers and I support their why for the need but for me, I rather have the cash..