I am fortunate enough to have - since mid 2009 - an Abrisud low-profile cover on my pool. We've had the pool for many years in its open state. The cover is a low arc made of an aluminium frame with double-walled polycarbonate sheets. It keeps the dirt out, locks children out, keeps the wind off and heats the water (but is a bu**er to vacuum). It is on permanently, being hinged up on the few very sunny days, and taken off for one day a year to clean. Oh yes, we get into the pool via a sliding hatch which is left open when we swim.
Right. Should I be managing the pool as an indoor pool? In other words with low cya. The FC doesn't seem to drop much at all, but there again we don't have much sun in the UK. At the moment the cya is up around 80 with FC at 5: I'm reducing the cya gradually by backwashing and moving away from trichlor tabs to bleach (and starting a proper test/recording regime). Is the only difference likely to be the cya/FC relationship?
I guess the answer is to test and record and see what happens, but I wondered if there were any other covered outside pool users with experience. Thanks.