Your "one-way valve" in the pump, obviously found another way...
Here's what SuperD said about this sort of thing:
" There is a one way valve on the pump that prevents back flow when hooked to city water. Remove the filter and make sure it's clean, then put water in the tank and run a couple of gallons using the pump. If you have debris in the pump running should clear it out and stop further back flow on city water."
Others have also said it: he might have said it the best...Good luck!
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