Agree with Bryan. My tap water reads 12ppm with my TDS and is 0 after it goes through the Tap water purifier and a cartridge does seem to last forever.
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14 gal Biocube Ocellaris Clownfish, Bi-color Blennie and snails
RSM 250 Ocellaris Clownfish, Yellow Clown Gobie, Green Chromis x 3, Kole Tang, Firefish, Scooter Blennie,1 Red Hermit Crab, 2 Fire shrimp, 1 Cleaner shrimp, 1 Sexy shrimp, various snails.
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