My tapwater TDS in North Vancouver is 9-10ppm. At the Pet Gallery it was around 13 both times I tested it. I'm just using DI and have probably burned through 1/8-1/4 of the cartridge and drawn a good 50 gallons of water from it. A new DI cartridge every year isn't going to break my back - I'm happy with that.
BTW, I'm assuming everybody is using the Aquarium Pharmaceuticals Tap Water Filter/Purifier? What chemical do you use to regenerate it and what's the process?
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