Quote Originally Posted by duraleigh
Yeah, I think your logic is fine on your CYA test. It's subject to a lot of inaccuracy from the dilutions but I think you're close.

If you have a water softener, you could limp by the rest of the Summer then drain and refill through the softener solving both CYA an Ca issues. (keep your chlorine up)
Clarification - The "tap" water I used was actually filtered water from my RO system.

I thought my CH was too low at 60 ppm.

I think I need to bump my Calcium up some. BTW, I do have a water softener, and that is exactly what we did about three years ago - we filled the pool partially with softwater (if I remember correctly it was approx. 50% soft, 50% hard).