Just moved into a 20 yr home & went to use the master bath/tub when I noticed low pressure from the shower-head. There's a pull up/down lever on the tub faucet to activate the shower but when it's in the 'up' position the shower has a low-steady stream at best but the tub flow is on as well when it should be diverted 100% pressure to the shower-head. The same occurs when I used the alternate shower/tub... Should I remove the shower-head on both assuming there might be dirt/debris buildup, do the faucets require replacing or is it a plumbing/pipe issue?
