Last night's test 18
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Must the check valve be installed before the pump? Can it be installed between the pump and the filter?
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The check valve will prevent water from siphoning out of the pump. It has a flap inside that closes when water flows in the reverse direction. Since your equipment is up hill from the pool, you would be more prone to have water siphon back into the pool when the pump is off. Check valves for pools are designed to be chlorine resistant, where a regular check valve may not, and fail over time.
What was your FC last night?
Must the check valve be installed before the pump? Can it be installed between the pump and the filter?