I have 2 bathrooms on the 2nd floor. One has good water pressure for all fixtures. The other doesn't. The problem bathroom had slower (but okay) pressure before a major plumbing repair (by contractors) on 1st floor. Post-contractor work, the low water pressure in both sink and shower is near torture. On a few occasions, without any changes I'm aware of, the pressure starts off great, then slows to a trickle by the end of about 3 minutes. Most times, though, low pressure is constant. I have not attempted any repairs yet. Reading online, I will check for sendiment, but it's hardly likely seeing that both sink and shower have the same problem. Be glad for any suggestions before calling the pros again. By the way, I complained after their work, but they said I'd have to reschedule for a new service call to investigate.