You would replace a flush valve or 'flapper' when it gets distorted or leaks slowly as they all eventually do. Take it out and go to Home Depot and you will see many better ones than there were when your toilet was made. Average cost $6-10.
Easiest way would be to replace the flush valve, otherwise there is a washer underneath that is easily replaced
That would be your flush valve in the tank
I would use my shrink-ray and then flush it.
You will probably clog your toilet or pipes if you flush anything but toilet paper. I would not recommend trying to flush underwear down the toilet.
Which part, the tank or the bowl? If it's the tank, you have a problem with a restriction between the tank and the bowl. If it's the bowl, you have an obstruction in either the neck of the toilet or the drain pipe below the toilet.
it would be impossible unless you had a toilet bigger than you!
If the toilet works each time on one flush, they use roughly half the water of a standard toilet. You would then use half as much a month on the toilet. They do not always flush completely on the first flush and the toilet is only a part of the water bill.
Bubbles in the tank when flushing the toilet can be a sign of a faulty flapper not sealing properly. This can lead to air entering the tank, creating bubbles. Check the flapper for damage or misalignment and replace if needed to fix the issue.
For a modern bathroom renovation, I would recommend a dual-flush toilet with a button flush system. This type of toilet allows you to choose between a full flush for solid waste and a half flush for liquid waste, which can help save water and is more environmentally friendly.
On the inner rim of your toilet where the water flushes out from the cistern, if these small holes are blocked it wont make the right angled pressure to flush a toilet
it would depend on the size of the pawn. ;)
I would intentionally overflow a public toilet by taking the lid off the back, then taking out the thing that covers the hole in the bottom. Then clog the toilet and just wait. The toilet will just flush and flush and flush and flush until it overflows. And then it will keep flushing. You could flood the entire bathroom with no one even knowing!