First question I have is what type of pool do you have. Calcium hardness is a definate issue for plaster pool but not that important for vinyl and fiberglass unless you have a heater or a lot of grouted tilework. Calcium hardness is increased by adding calcium hardness increaser which I belive is 73% calcium chloride(someone please check me on that!). It can be found at your pool store and also at a home improvement store. I keep my calcium hardness at 140 ppm for my heated fiberglass pool/spa and I use softened water for my fill since my whole house including the outdoor faucets is plumbed thru the water softener. (I know, rather dumb, but I bought the house that way and it's just not cost effective to change it!)
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