I came across the CYA test comments using 1/2 pool water and 1/2 water with no CYA. I have been interpreting the results using my test kit [Taylor K-2006C] to be 125 or so. Using the 1/2+1/2 method it read 90, so that means CYA @ 180. All else is checking out ok. Looks like I need to drain and refill? Any additional suggestions or comments.