Factors that reduce water pressure
Ever wonder why you have less pressure in the upstairs shower than in the basement? It’s because it takes more pressure to get the water all the way up there. For every 2.31 ft. of vertical climb in your water line, you lose a pound of water pressure. Thus water that enters the house at the basement level loses 11 lb. to 12 lb. by the time it travels to a second-floor showerhead. If your house water pressure is already at the low end—40 lb. would be low and 80 lb. would be high—this is a significant loss.
Now let’s add in a water softener and an iron filter. These water-conditioning units each decrease water pressure by about 5 lb. of pressure; therefore, we lose another 10 lb. of pressure after water conditioning.
If the water pressure entering the house is sufficient (50 lb. to 80 lb.), you could survive the pressure loss. But in rural areas where incoming water pressure might dip down to 30 lb., there will be a problem. If added to this there are other poor conditions, such as too small or clogged pipes, improper valves, or poor showerheads, the flow may be reduced to a trickle.