I was told that pool water should be changed every 5 yeras or when the calcium reached 1000 ppm. I have not had much of a problem cleaning the tile calcium every month before it binds too much but this year it seems to be accumulating more. The pool water is 3.5 years old now, always properly maintained chemically.
Its now 4000 ppm and and I would like to know what the ideal determining factor is for replacing the water and what, if anything, should be added to the new water when its changed,
Dan