Has anyone ever tried one of these things to supplement a sand filter?
http://www.lowes.com/pd_565737-42805-NCBF18K110BF_4294610223_
Mind you I would never buy that specific thing however the idea of getting a $30 submersible pump along with some PVC and connecting it to a decent paper cartridge (basically what the makers of that thing did but at total cost about $80 instead of $600) does seem workable.
http://www.lowes.com/pd_565737-42805-NCBF18K110BF_4294610223_
Mind you I would never buy that specific thing however the idea of getting a $30 submersible pump along with some PVC and connecting it to a decent paper cartridge (basically what the makers of that thing did but at total cost about $80 instead of $600) does seem workable.