Well I checked the filter on the ground loop cicuit as recommended and was astonished by this substantial lump of stone & cement (I think). Still it clearly was filtered and there seemed little else. There is no significant fluid loss.
There is also an air-bubble-type sound from the ground loop near the GSHP when operating; not loud but interesting. I have tried the vent on this (when the p[ump is not operating), though the tank is barely above this. We shall see.
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