A pressure regulator would have been installed by a previous owner. To answer your own question about the water filter and whether it filters all water or only that from the city water connection, remove the filter, (put in a clean container) and try water pressures at faucet on pump and city water. Another possibility is a failing check valve. There is most likely one to prevent pump from back flowing out the city water connection. It might be partially blocked or restricting water flow.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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