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Moltenfe, good suggestion.
Guys, here's what I did tonight.
Removed the wooden decking over the biofalls. Turned the pump and autofill off. The skimmer box water level didn't move, but the biofalls water level is dropping at about an inch an hour...will check it again tomorrow. If the checkvalve is working, there might be a leak at the biofalls or skimmer bulkhead fitting. If the checkvalve wasn't working, the skimmer overflow would would be draining (which it isn't).
If the pump was running, the water level would drop faster given the pressure. This might be it...I'll touch base later.
Should
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