I just got my TF-100. Here are the results.
Pool Temp 65 degrees. The pool is in a courtyard and gets no direct sun in the winter (summer is a different story)
I have a chlorinator now. I'll add wet acid tomorrow following pool math's formula. I have too much chlorine and my CYA is high. Pool math suggests replacing 33% of my pool water to lower my CYA. I will consider using bleach instead of the chlorinator, but my I am concerned with summer pool maintenance. We travel for two or three weeks at a time. the chlorinator eliminates testing every day. Otherwise, I am willing to put in the maintenance time and effort. What do other owners do while they are away?