I have a single hole roman tub filler but have low gallons per minute. Do I need a high pressure valve or something to get more psi ?

How is the pressure at other faucets in the house. Remove and clean the aerator.

Harold asks a good question. How is the pressure throughout the house? What is the brand name of your tub faucet? Regards, Tom

The faucet is a Price Pfister and it is brand new. The water pressure in the rest of the house is good including the shower. Could it have anything to do with the fact that it is a single handle roman? Do we need special valve to create more pressure? Thank you Vicki