Common misunderstandings of siphon pot

Mistakes:

Today and usual some, after the water rises, the vaporization alcohol lamp fire adjusted less, this lamp is not like a gas stove, there is a lag, after stirring, the fire is gradually smaller, waiting to determine whether the extraction is good, suddenly, coffee fell down? The brain suddenly turned on. Why is that? Probably did not hang the hook, remove the pot, sure enough. Because the grounds went into the lower pot, I had to put the filter hook on and pour the coffee into the upper pot to filter, but the coffee came out slowly, and I think it was because there was grounds stuck between the filter and the upper pot that the coffee came out. I tried it when I was cleaning, and it didn't come out just drips. It occurred to me immediately that I didn't fully understand the principles of siphon pots and that there were many mistakes.

How the siphon works:

The water in the lower pot heats to steam, and because of the seal, it rises up the long pipe to the upper pot. Where does the water enter the kettle? Is it from the filter cloth, as some friends say? Definitely not. I read here a friend said that a good siphon pot from the filter cloth water, water from the surrounding filter to explain the poor quality of the post after doing an experiment, the results and this friend said different, Ken filter cloth like a balloon bulging up, water from the surrounding out, I saw some discussions also said, good filter cloth water permeability is poor. Why does water come out of the surroundings? Steam pressure jacked up the filter. This is why some friends complain about slow water, and some friends say that with a good pot with a good filter cloth (flannel), you don't have to worry about coffee flowing out when pouring water. The pot of coffee is how to enter the pot, no heat source, pot steam reduced to internal pressure less than the external pressure, the pot of water and sucked back, wipe the pot with a cold damp cloth, is to form negative pressure as soon as possible and as much as possible. Water is mainly sucked down from the surroundings. And that's why we end up stirring it, some friends say it's to make the slag float up and then fall down, which is impossible, and it forms a spiral pit that makes the slag funnel shape, more in the middle, less outward, so that the filter doesn't get clogged around it. Finally, it forms a dome. It's better if the hills are only on the filter cloth.

The siphon pot looks simple but is cleverly designed, with a spring-loaded filter, which is an automatically controlled valve. Why is HARIO's original filter cloth a poorly permeable flannel? The valve will not work without a seal. The filter cloth also forms a seal ring between the upper pot and the filter. Some friends say that bad pots will leak slag. I think it will leak if it is processed very poorly. The filter is not aligned should be an important reason, not stirring before turning off the fire, so that the slag at the bottom, before the filter closed into the next pot, or stuck filter, so that finer slag into the next pot could not be a cause?