■ Leaking At The Bottom

When the sewage backs up because drain line is clogged.
The sewage can possibly leaking at the bottom.
Even sewage does not back up, if the toilet flange is too high, sewage can leak at the bottom because wax ring will be squeezed too much.

  ■ Leaking From The Tank 
Mostly there are 3 reasons of leaking from the tank, -.Overflowing from the tank. -. leaking from the rubber flange between the tank and the bowl. -. Leaking from the bolts. You can see how to install the bolts to prevent the leaking and you need a help from a specialist for other leakings.

Perfect installation
You need extra rubber and steel washers between the tank and the bowl.
If you don't put the extra washers between the tank and the bowl, there is a possibility to leak after 3~4 years.

  ■ Water Flowing Continuously

If you open the tank, you can see a plastic bar, we call it flush valve, and water is overflowing to this bar. -. You need to adjust the fill valve or change it.
There is a round rubber cover at the center of the tank. We call it the flapper. This rubber cover is deforming after 3~4 years in the water. and water leaking through the hole of deform. You need to change the flapper.
When you change the flapper, suggest to remove the hole like the picture. It will much easier to install the flapper.

  ■ Clogging Often
There are several possible reasons for this. The most common reason is the lack of power. If a toilet flushing power is not strong enough, the toilet can be clogged by human waste or even toilet pape.
There are holes at the top of the toilet bowl which the water from the tank flows out of to flush the toilet.
After you have had the toilet for more than 3 years you will notice calcium build up in the holes where the water flows. When the holes become smaller and smaller the flushing power is reduced which then causes the toilet to clog more often.
One of the ways to solve this problem is by using acid to eat up the calcium. You should ask a specialist to perform this task because the acid is very dangerous.
The best solution is to replace your toilet.