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Thank you Bannerman for that explanation of the how the regen cycle works... that makes much more sense now! [Many folks with aquariums will use an RO system to remove sodium, chlorine and other contaminants from the tank fill water.] I do have an RO system, but my fish tank is 180 gallons, so...

I have city water with pretty low hardness of about 6 gpg. I'm going to use Potassium Chloride (I have fish tanks and don't want any sodium in the water) so I'd like to use as little salt as possible to keep cost low. I just installed my system tonight and it seems to be running fine with no...