When the water started flowing poorly again I realized something was wrong with the water in my apartment.
There was low pressure, and the boiler was giving very slow heating.
I contacted repair services, but everyone gave different explanations — filters.
Then I started looking for answers. That’s how I found this website: https://stroyka2001.kh.ua
There they clearly explain plumbing mistakes.
After reading a few articles, I understood what had been overlooked.
I advise paying attention to it to anyone who wants to figure out water problems.