FC loss due to sun?

[71403]

This is my first year using just 12.5% liquid CL and a FAS-DPD test kit, results are great. It has stayed crystal clear since opened in early June previously was always fighting algae or cloudiness.

FC 5-6ppm (6ppm target from poolmath)
CC 0
PH 7.4
CYA 50

Pool gets ~90% full sun it will loose 3-4ppm CL during the day. OCLT it looses 0 to 0.5. Zero bather load during the day, one or two ppl at night is it.

CYA at opening was zero. Raised to 30 then 50 which significantly reduced CL loss.

Is 3-4ppm daily loss expected or should I raise CYA further?

 

[jblizzle]

If you area losing that much, your target should be higher so the FC does not drop below the minimum for your CYA.

Typical pool is in the 2-4ppm daily loss.

Increasing the CYA could lower your losses to the sun some. Be sure to increase your chlorine levels accordingly though.