What I will tell you now is used by experienced plumbers to troubleshoot apartment water pipelines, where the pipe cross-section is quite small. Ordinary residents, home craftsmen, this information will be useful because it is easy to find out where the problem area is.
Such a "creature" was found in front of the water meter, it blocked the flow of water. Which could lead to pressure drops in the DHW, for example when taking a shower.
In this case, I changed the counters and the problem was discovered by accident. The debris has been removed.
How easy is it to identify the problem area due to which it is possible to reduce the pressure in the pipes?
It is in such a section of the pipe, which is presented above, in the photo that problems arise. If you do not know how to calculate such a section, then the entire layout is cut out. And this is wasted money.
Are you dissatisfied with the pressure in the pipes? Clean the coarse filter first. If there is no such filter, which also happens, then we look for the problem area in the following way:
Turn on the water at full capacity. But in such a way that the noise of the pouring water was the least or muffled. Approach the inlet tap and throughout the wiring you begin to LISTEN to the hiss of water in the pipe, if there is a hiss in a certain area, then in this place the pipeline narrows. The water rests against the narrow walls of the pipe and the flow begins to accelerate, a hissing noise occurs.
In this piece of water supply, manipulations should be carried out to clean or cut out the problem area.
That's the whole trick, and you knew about it?