usually when you take it off and flip it around there is a little plastic yellow red or sometimes green gadget right in the middle its called a flow restrictor and you can pull it out with a pair of needlenose pliers
There is a screen and/or a water saver in the shower head. The screen may be plugged with sediment from in the water.
Hold it upside down, drill upward, use an Allen key to pull it out. Don't drill down as the stuff will plug the holes of the head up.
More "VOLUME" flowing from the tub spout then the shower head as the shower head has a flow restrictor
You can find a large number of water saving showerheads. Bricor makes the best Low flow shower heads, but they also charge about ten times what you'd pay for the no frills Ultra Saver (3 to 8$)
you did not pay bill
Remove the shower head and clean out anything that might be blocking it, such as hair or debris. Replace the shower head and turn on the water; the water should be running.
A power shower head mixes moving air with water, to increase the strength of the water coming from the shower head, while using less water. The advantages are lower water bills, using less water and protecting the environment. Some reviews of power shower heads indicate that the claims are untrue, and that the product does not work as is a waste of money.
To prevent any back water from the shower head and also the water contamination into system.
1- plugged shower head 2- defective diverter
Employ a plumber.
It depends on how much water comes out of your shower head.
Seats in the main valve body are leaking by, allowing water to go to the shower head.