Was the toilet recently installed or is this a new problem with an old toilet? if the toiled was recently installed, it may not have been set properly on its mount, causing limited clearance... water will pass, but not anything larger. reinstall toilet. if it is an older toilet, that means there is a buildup in the drain pipe causing the blockage. first try using any of the draino type chemicals to clear the blockage. if that does not work, remove the toilet from its base and visually inspect the pathways. remove any blockage and reinstall toilet- be sure to use a new wax ring and bolts.

Hello matthewmiles!

Thanks for the response. We just bought the house, and therefore do not know how old it is. It sort of looks fairly new.

Regards,

Emil

Hello matthewmiles!

Tried the Draino liquids without success. I guess it is time to remove the toilet. :-)

Regards,

Emil

My guess is you have either a Kohler toilet or a 1.6 GPF correct possibly an American Standard.

If this is the case good luck