I have a Water Furnace Premier 2 with three vertical wells 200+ feet deep. The flow center was installed two years ago to replace the original geosystem flow center installed in 1986. The pumps in the current flow center have started a pulsating vibration which results in a low frequency sound throughout the house. Annoying, yet the technician tells me this is normal. When I first noticed the vibration and called the technician, the outlet hose coming out of the top of the flow center was partially collapsed. Tech used galvanized pipe to square off the loop. I just checked again and now the inlet side is compressed. The unit is currently in heat mode (we are in northwest Oklahoma) and has no problem keeping up. What might be causing the pulsating vibration in the flow center pumps?