how can I decrease water level in toilet bowel?
The Water level in my toilet bowel is too high, I need to make it lower, how can it be done?
As you can see in the included diagram*, the water level in the bowl is dictated by the height of the trap. Nothing you can do to remedy that except buy a toilet that meets your needs or manually force excess water past the trap with a plunger until you get the desired level. (if this is a case of trying to avoid ‘splashback’, laying out some toilet paper, flat not crumpled, across the surface of the bowl water should minimize the effect.)
If, in fact, you are talking about reducing the amount of water needed per flush, adjusting the float or placing a brick or rock in your tank will accomplish this but, be aware that your toilet design may not allow for efficient flushing of waste in this manner. In other words, if you flush the toilet and there was insufficient water force to push the waste past the trap, and you have to flush again, you’re wasting water, not saving it.
How to make your own water level