It is worth checking the outlet holes under the rim and the ridge under the
rim using a small mirror for signs of anything that is obstructing or
disrupting the water flow. If you are in a hard water area you might find
limescale. You can try reducing the volume and therefore the pressure of
water that falls when you flush; a brick in the cistern will reduce the
volume by about a litre, and if you have a hollow plastic ball float on a
metal arm you can bend the arm/float down to further reduce the amount of
water that fills the cistern to make the water inlet valve shut off sooner.
If none of that works that leaves a plastic 'collar' that fits around the
rim to deflect the water downwards. These aren't available to buy, I made
one from some flexible plastic sheet material about 2mm/one eighth of an
Has it always been like this, or has it happened lately? If it's always been
like that, have you got a high-level cistern (yes I know they're rare
nowadays) with a pan meant for a low-level cistern?
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