re: Addendum: (Strange water values) Matt, >> Given the very soft water here, I'd feel safer being able to see the >> bubbling occur I feed CO2 into the intake of my canister. I also like to see the bubbles so I replaced part of the uplift with clear acrylic tubing. I do have to keep it clean so I can see through it, but that is not that hard. Usually I turn off the canister for a moment so I can count. Doug Valverde Winnebago MN