Just unplug your old filters and plug in new filters and you are done = no mess

or 100 gallon per day (GPD) RO membrane with the best 98-99

Saltwater Aquarium Anti TDS Storage Tank for SMART Evaporation Top Off Automation

You can save money by buying a bag of catalytic carbon with enough Catalytic Carbon to fill one cartridge

ANION DI Resin Color Changing Bulk Media PREFILTER Just unplug your old filtersANION DI Resin Bulk Media Color Changing Nuclear Grade Single Bed ANION Resin Professionally packed in a a heavy duty 5 mil Mylar bag with a very nice Ziplock seal the same day you order. (one 5# bag is more than enough for 4 x standard 10" refills) The Anion di resin media color changes from blue to amber as the resin exhausts. This helps you to visually keep track of the quality of your water. Media bags are packed the same day they ship to