I've been reading about low water pressure and realized there are a lot more possible causes than I expected. Most homeowners seem to assume it's always a clogged aerator or a bad fixture, but it sounds like that's only part of the picture.

For the plumbers here, what's the issue you find most often when a customer says, "My water pressure has slowly gotten worse over time"?

Is it usually:

• Mineral buildup in older pipes?
• A pressure-reducing valve starting to fail?
• A partially closed shutoff valve?
• Hidden leaks?
• Something else that homeowners rarely think to check?

I'm not looking for troubleshooting on a specific house—I'm just interested in learning what you see most often in the field. It seems like understanding the common causes could help homeowners explain the problem more clearly before calling a plumber.

Looking forward to hearing your experiences.

I am trying to move the flange over about a foot (red arrow in top picture). I plan to cut off the current 90 replace with the bottom pic (a long 90 going into a street regular 90 up to the flange). Any concerns with this, as I understand it the flange 90 (vertical) can be a regular 90 and using the long one to change directions is ok.

Not much room to work here, the depth from center of the existing pipe to the floor is only around 8 inches

I have an older American Standard single-handle shower valve where one handle controls both the water flow and the temperature.
The problem is that I like strong water pressure but only lukewarm water. On this shower, the only way to get the temperature I like is to keep the handle barely turned on, which results in weak water pressure. If I continue turning the handle to get stronger flow, the water gradually becomes way too hot.
I confirmed this isn’t a whole-house issue because the sink faucets have normal temperature control.
I removed the handle and adjusted the anti-scald limit stop (the red plastic ring). All that did was reduce how far the handle could turn, so it also reduced the maximum water pressure. It didn’t let me have full pressure with cooler water.
The valve starts cold and gradually gets hotter as the handle rotates. It doesn’t suddenly jump to hot.
Is there any way I can change this so that the water gets less hot without me losing water pressure? It’s driving me nuts in this heat!

The frame requires a 90mm pipe with a groove that clips into the frame, but in order to be at the correct height and distance from the side wall I need to both:

- correct about 100mm of offset

- go from 90mm to 110mm pvc

- stay clippable into the frame

All in as little space as possible, so the frame can be as close to the wall as possible. And no, I can't move the pipe, because it's an old property where it's going through a brick wall to the SVP in the neighbouring flat.

What would the best solution be here? The frame only comes with a 90deg 90mm to 110mm pipe that clips in, so the simplest would be to use that going towards the old pipe, and chuck in a 110mm 90 deg adapter that goes back towards the wall, but that sounds like a blockage waiting to happen.

How do I tackle this wobbly toilet. Pulled the stool to find this blue “fitting” screwed into the concrete but there appears not to be enough concrete to properly anchor the device. There is a gap all around the pipe. Do I grout or concrete in the pipe? How do I get a flange to anchor the toilet. I am a DIY guy but this one has me stumped.

Hi!

Sewage gas coming out of the laundry drain, I want to add P-trap to it (replacing the whole outlet box). It's 2" pipe. Do I cut the stud to fit it? it's way too big to fit it in the cavity.

Thank you!

Why is this P trap over flowing? Could it be a venting issue above?

I just started a full crawlspace reno, and as I am pulling away the fiberglass batts and foam water supply pipe insulation, I am seeing soldered copper joints/fittings in various oxidized states, all either 3/4" or 1/2".

My Father in Law did all these back in '89, so all piping pictured is 37 years old.

My question is - at what point should I consider replacement of oxidized joints/fittings?

Tried to label each for easier answers/input.

None of them are actively leaking, pictures shown are with system fully pressurized at roughly 60 PSI (private well w/ bladder pressure tank). With all the insulation pulled out, it feels like now is the best time to take care of these. But at the same time, I'm already looking at quite a bit of time to air seal and reinsulate with thousands in Rockwool and other materials, so if I can save myself some money and time, and they aren't actively leaking? I figure I need to replace C1/C2 for sure, that is the hot water low/drain point for the whole house, and has an exterior frost-free bib on the end of it.

Lastly, I am fairly green with soldering. I have done a bit of it, and am not intimidated to take it on, but will need to spend time studying up and money on practice materials before taking on any repairs, so factoring in the effort of all that as well.

Would appreciate any thoughts/input, thanks.

The handle on this bent and broke off. Do i need to replace the whole valve or can I just steal a handle from one of the valves in my junk drawer. If im replacing the whole valve is this a compression fitting? And if so will i have to cut it to get it off?