I need to remove the shower head on a delta monitor. I have never done this
before. Do I need to turn off the water supply? I'm assuming that the
shower head just unscrews. Will I need to put some teflon tape over the
threads before I screw it back on? I can see that there is some on the
threads now. The problem is there is reduced pressure to the showerhead
for a while and then after a couple of months, the pressure is good for a
while then back down again. I'm assuming there is some debris in there that
moves around. Main thing I need to know is whether to turn the water supply
off first. The showerhead is 7 years old and worked great until the last
few months.