Our single piece Kohler toilet does not flush clean. It appears to not be using enough water quick enough to give a clean flush. The tank level is just above the white line on the over flow pipe level so there is enough water in the tank. If water is added to the flush from a separate container the flush will be clean. What could be done to improve the flush?fblechen

The flapper at the bottom of the tank is leaking and needs replacement.

THERE ARE LOTS OF SMALL HOLES WHERE THE WATER COMES OUT OF IN THE RIM OF THE TOILET BOWL, SOME TIMES HARD WATER BLOCKES THES AND THEY NEED TO BE CLEANED. THEY CAN BE CLEANED USING A LARGE SEWING NEEDLE, PUSHING IT INTO THE HOLE UNTIL IT FEELS A BIT BIGGER, YOU WON'T DO DAMAGE AS IT IS VERY HARD METERIAL. a
AFTERWARDS TURN OFF THE WATER, AND LIFT THE VALVE AT THE BOTTOM OF THE TANK AND PUT SOME TOILET ACID INTO IT. THIS WILL ALSO HELP CLEAN THE HOLES.

The power it flushes with is relevant to the amount of water in the tank if the water in the tank is not up to the mark on the tank wall then adjust the water level float until it is. If this problem just started out of the blue then you need to look into an obstruction in the toilet water seal trap or possibly the drain.

If I understand correctly, your water level inside the bowl is 3 or 4 inches from the top of toilet seat?
Sounds peculiar to have that water level since you would get splashing etc.
That is not sanitary, and would be a code violation.
Look at side profile of tank.
Look at porcelain behind bowl and you can see outline of "s trap."
This is the internal trap that each toilet has built in.
Purpose of trap is to a) set water level inside bowl and b) just like a sink trap, seal pipe from sewer air from entering home.
Photo shows trap on sample toilet, with line showing approximate level of water inside bowl.
Since photo is at an angle, the line appears to go downward instead of level. Again the line is approximation, and photo intended to show where you can look on your toilet.
Your tank should have similar s-trap feature. From the feature on your tank, you can see what level water is intended to be inside bowl.
Some more expensive tanks, outline of s-trap is not apparent.

If the water level is so high that you experience unsanitary conditions, this is a code violation, and toilet should be replaced.

Quick web search turned up Kohler contact page: http://www.us.kohler.com/general/contact.jsp
KOHLER Customer Care at
Phone: 1-800-4KOHLER (1-800-456-4537)
Hours: 8:00 AM - 5:00 PM (Central Time) Monday to Friday
You can refer Kohler to this link on Fixya so they can clearly understand issue.

New WC's are only 6 Litre capacity. But is it? check water level to make sure its high enough! you should be able to adjust the water level from the water inlet valve.

order a water pump. so the preasure of the water can suppy the requirements pressure of your water closet

flush time depends on how much water is in it,
the water level flote has an adjuster on it, but i cant rember were it is,,, sorry

These models need to have a flush valve flapper that has a styrofoam float on the lift chaninof the flapper. Go to hardware store or home improvement store and get a 'Korky brand toilet tank flapper with float 'ball". Cut the rubber ring piece away from the flapper and you don't need it (see cut here marks on flapper). Install flapper and adjust the float fairly close to the flapper.
When the water level drops in the tank and reaches the level of the float on the opne flapper, the flapper quickly closes causing the toilet to have a "surge" of siphon action which forces the water in the bowl to be drawn out.

Make a small mark with a pencil or marker that can be erased of were your water line is in your bowl. Pour some water from a bucket into the bowl SLOWLY and see if the water line rises or drops back down to your original mark. If it drop back to the original mark, then that is the way the toilet was made. You won't be able to do anything about it. If it rises and stays at a higher level, then you have a problem with the fill tube in the tank. You will need to call a Pro!

This type of flush system can be re presurised quickly by holding down the flush handle for about good 2 minutes, then release , wait for the tank to be refilled with water.
Now you can flush away your inner rotting mess down tube good-by...