I bought Nutrafin KH/GH test kit so I could use "Chucks planted aquarium calculator" to figure out my CO2 levels for my plants. I new my water would be hard because it leaves evidence of that in my tea kettle. Also I knew it would be well buffered because ph down will only affect my swimming pool water for a few hours at most and the PH goes rightback to the level it comes out of the tap at. My GH is 70ppm and KH is 130ppm. Does any body else have water this hard? My fish and plants seem to be happy and healthy. Also what are the "degrees of hardness" that people talk of, is that a different test kit? Or is it a calculation based of the GH/KH readings?