STS,

I suspect that the limestone will have some effect vis-a-vis your rising pH. Chem_Geek hopefully will chip in here. The muriatic acid will do some work on the limestone, so some adjustments will have to be made.

If you can get access to a Taylor 2006 test kit, it will be a great help in testing your water while waiting for Ben's PS234 kit. The numbers will then help us to help you.

Kurt, the numbers I took this morning were:
FC 5 ppm
pH 7.2
TA 90 ppm
CH 270+ ppm (ran out of R-0012 reagent. Duh!)
CYA 60 ppm

Will get another CH reading later today.

Pat