My indoor pool will be one year old at the end of this month (specs in signature). For the past 8 months, the free chlorine demand has been pretty stable, with overnight FC loss of about 0.2 ppm, and a few bather-hours per week. Keeping the IC40 at 4% (with the pump running 24/7 in conjunction with the dehumidifier) had been keeping the FC level stable at 1.5-2.0 ppm ... until a couple of weeks ago when the FC level increased from 1.5 to 2.5 ppm over one week with the IC40 setting unchanged at 4%. The only change I made around that time was to decrease the pool temperature from 88 degrees to 86 degrees. Everything else remained unchanged, with the same few bather-hours per week, with environmental factors also unchanged in the indoor environment.
Could the functioning of my SWG be increasing/malfunctioning (producing more FC at the same 4% setting), or could the decrease in the pool temperature by only 2 degrees have such an effect on decreasing FC demand?
Pool water clear
FC 2.0
CC 0.5
pH 7.5
TA 80
CH 290
Salt 3600
CYA 15 approx. based on prior Tri-Chlor use
Could the functioning of my SWG be increasing/malfunctioning (producing more FC at the same 4% setting), or could the decrease in the pool temperature by only 2 degrees have such an effect on decreasing FC demand?
Pool water clear
FC 2.0
CC 0.5
pH 7.5
TA 80
CH 290
Salt 3600
CYA 15 approx. based on prior Tri-Chlor use