Why does the water from the kitchen tap turn dirty? The master repairman's words made me understand

Whenever Huahua feels that life is treating her pretty well, life always quietly strikes at that very moment. And sure enough, lately the kitchen faucet, for some reason, has been giving out water that is either earth-colored or yellow, just filthy!
Everyone would agree this is a real hassle, right? How important is the water in the kitchen! We use it every day to wash dishes and scrub pots, to wash vegetables and rinse rice. If the kitchen water is not clean, doesn't that cut off our food supply? People can't go without eating, so sure enough, life finally struck at Huahua...
That was no solution, so Huahua quickly called a repairman to check and fix it. The repairman told me that our home's water pipes had been metal pipes when the place was first decorated, and since this residential complex is fairly old, the hardware inevitably rusts. It is precisely because this metal rusted that the water became murky.
The repairman told me that generally speaking, if the water pipes in a home look metallic on the outside, then they are probably galvanized pipes. This kind of pipe only looks somewhat respectable on the outside, but in fact it is not very useful, and over time it will rust. That is exactly the situation in Huahua's home. If we use the household pipes for drinking water and so on, we must pay attention and repair them promptly once we notice something is wrong. Don't drink unclean water and harm our health!
Then why are there still so many sellers selling this kind of pipe? It is simply because galvanized pipes are relatively cheap, so many newbies who have just decorated their homes don't know any better. They spend less money, but they get a lot more trouble! So here Huahua wants to advise everyone: do not use galvanized pipes like the ones in Huahua's home, especially in places like the kitchen.
After the repairman finished explaining, he told me to just replace the water pipes. The repairman said that generally, when replacing pipes, it is best to use plastic pipes, that is, the fairly familiar PPR pipes. Many households use this kind of pipe now. Its advantages are that it does not rust and is very corrosion-resistant, and the most crucial point is that it is non-toxic, so everyone can use this kind of pipe with peace of mind. The quality of PPR pipes is also quite noteworthy; basically, once this kind of pipe is installed, using it for over a decade is no problem!
If we were to name the drawback of PPR pipes, it would probably be only that they are not heat-resistant! So basically no one uses PPR pipes for hot water pipes, and everyone should pay attention to this when using them.
Besides plastic pipes, there is actually another kind of pipe with relatively good quality, namely stainless steel pipes. This kind of pipe has all the advantages we need in a pipe: it not only does not corrode and does not rust, but it is also resistant to high temperatures. It can be called the best material for pipes.
It is just that good things naturally cost a bit more, so those who can afford it can use it over a large area throughout the home. For ordinary households, we can lay stainless steel pipes only for the hot water pipes.
After hearing this whole speech from the repairman, Huahua really felt she had gained a lot of knowledge. I wonder if everyone understood the pros and cons of these types of pipes? There is no need to say much about galvanized pipes: if you can avoid them, avoid them. PPR pipes are relatively cost-effective and also decent in quality. Stainless steel pipes are the most expensive and also the best in quality.
Everyone can choose according to their own circumstances, and they can even be combined with one another, so that a situation like Huahua's dirty water will not happen!