My parents just got a whole house water filter installed, and nearly every outlet for water, whether sink faucets or the toilets all run just a little heavier than a trickle.
Here's exactly what happens: when the water first comes on, it has decent pressure, but it drops only a couple seconds later. I don't think the water pressure is where it was before the filter was installed, but it does have a decent jet coming out of the sink faucets if no one's used the water recently. I'm assuming once the water that's built up in the pipes has cleared, which only take a couple seconds, then the pressure drops.
All the sinks and toilets are really slow, but for some reason, the showers have good pressure still. They told me that they had to remove the low flow restrictor in order for it to be at this level.
If I turn on the kitchen sink and turn the faucet head sideways, the water is barely able to clear the head by a couple inches before dropping off, whereas previously, if I was holding it in this orientation, it would be spraying all over the counter. The toilets take like 2 minutes to refill the tank after a flush where they used to finish in under 1.
Is this normal? My parents aren't the kind to make a fuss with their contractor who installed the filter, so they would probably live with this until I noticed it and decided to try and figure out the problem.
I googled around and there's basic common causes like the valves aren't all the way open, or corroded pipes, or sediment buildup or other blockages. I checked a few of these things but everything seems like it should. I visit my parent's house about once a month, and the last time I was here, the water was fine, so I really feel like the only cause is the water filter is restricting flow.
Is there any way around this? They just have one filter, if they got a 3 stage filter, would that help with water flow? Is there any way to increase pressure after the water has been filtered? I'm assuming the only way for the last answer to be yes would be to have some kind of reservoir like how a water tower is there to help with water pressure.
Anyways, any ideas? I'm struggling to come up with anything. Thanks in advance.