Well, pumped down around 38% or 3600 gallons and refilled. Can't wait for my water bill.....
results CL <.5, pH stll around 8, CH 225, TA 90 (expected it to drop)..., and CYA is now around 45, which is about on target.
calculated adds with pool math
added CL, Acid, and CaCl2. so will let it stir for a while and test again later today.
but all in all, a successful partial drain....unfortunately the solenoid valve in my solar heater hasn't cycled so its pretty cold.
Hope they can come today and check that out..........I need to get some heat in there.