Question

water from faucet starts with pressure but slows down

Answer 1

Check the strainer/screen to see if it has any debris in it that may be reducing the water flow. Also, newer faucets have a strainer that allows reduced gpm (gallons per minute) compared to older faucets, which are free-flowing. It is common for the newer reduced gpm faucets to have a strong initial stream (pressure) immediately when the faucet is first opened and then the water stream is reduced. FYI, the newer faucets have the gpm figure is on the strainer/clean housing (the part that can be unscrewed).