Yes there is one between heater and filter.Are there any check valves in this system?
Yes there is one between heater and filter.Are there any check valves in this system?
OK -- So when the pump shuts off, that check valve is a closed at the highest point of the system. That creates a vacuum on he filter side. Like JamesW, I am surprised it is enough to create your issue.Yes there is one between heater and filter.
I was under the impression the check valve was needed to keep the salt/chlorine from going back into the heater.OK -- So when the pump shuts off, that check valve is a closed at the highest point of the system. That creates a vacuum on he filter side. Like JamesW, I am surprised it is enough to create your issue.
I would consider moving that check valve. Most likely to before the pump inlet. Others can check me on that.
I was under the impression the check valve was needed to keep the salt/chlorine from going back into the heater.
Also this happened the first time right after build. Which was before the heater/check valve was installed. Heater check valve installed 2 months ago.