How can I raise the level of water in a toilet bowl.

Sperrins - They all set different , SO I need to know ,WHAT KIND OF WATER FILLER VALVE IS IN THE TOILET TANK?? > IF you don't know then describe it and may be I can help you , Waiting for your reply, GOOD DAY & GOD BLESS:::: F.B.E.

Check out the pics. Below Sperrins:

If first pic. Looks like your set up, then should just need a screwdriver as in the picture, to turn screw and increase water volume in tank.

If second pic. Looks like yours then you need to squeeze the water level adjustment clip and slide it to adjust the water level.

The water level needs to be between 1/2" and 3/4" from the top of the overflow pipe.

If niether pic. Looks like your tank... get back to us and let us know more... Good luck... Mark

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Follow Massplumbers advice about the tank level and be very sure the small tube,( #5) is connect to the ballcock and runs to the white overflpw tube. This is the tube that puts water in your bowl as the tank fills. Good luck, Tom