All the toilets in our 5 year old house have been leaking for a while now. The Geberit cistern flush valve is letting water leak past into the bowl. We've also noticed a marked increase in our water usage.
Have removed each Geberit valve and found that in all three of the silicone (?) washers were covered in pimple like bumps. Water trapped in pockets under the first layer of the washers.
Ideally these would be replaced, however I've found a way to easily and quickly fix them.

- Update -
Have had a few water bills now and found:
Prior to the fix our water usage was 450 L / Day
After the fix our water usage was less than 150 L / Day

That's 3 toilets all suffering the same problem and resulting in a huge waste of water. Our water usage dropped by 1/3!

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