I have had the pump for 3 years and this is the second check valve to go bad. When it happens my bleach tank slowly fills up with pool water.
I saw references to the fact that the pump should prevent backflow and it probably does, but a little still probably backflows.
I saw references to cleaning the check valve, but couldnt find the instructions
How often are people's check valves failing and if they are failing this often, does anyone have a better source?