My CYA levels are too high, and I need to fill and drain the pool. I know to do this safely I should do this in steps, and never completely drain the pool. I read on previous posts that one can take the water level several inches below the skimmer. What happens if I let water level go below the skimmer weir level? Will the pump lose prime and burn out? I have a handle near the intake to the pump, and I can completely turn off one skimmer, but not both.
Also, is there ever a need to backwash a cartridge filter? On the outlet valve leading from the filter, I can turn the handle to "cleaner" (vs. to "pool") but I am not sure what this does. There is a guage on this part of the pipe as well. I inherited the pool when we bought the house, and was never sure about this. Thanks!
IG gunite; 15,300 gallons; cartridge filter; no spa; Houston, TX