Sorry guys for taking this off topic. If original poster wants me to move this conversation elsewhere, happy to do so. Just PM or post here to tell me. how much does a Kati-ani system cost? How often do you need to recharge resin? I am a erratic/lazy reefer... So this system may not be for me... ---- Someone should make a chart of the cost benefits between these options. For me, with my 150 gal tank and 5-10 gallon 2-3 week water changes (see what I mean about lazy?) and maybe 5 gallons every 3 days topoff... Not sure I need these. Gimmick: How many gallons do you make to justify these? U have a super large tank?