I just installed a dual flush toilet and the first thing it does is start tricking water down the bowl. The instructions called to cut two rods inside the cistern if this happens. I'm too scared to do this with a new toilet, and i don't get charged for water where i live, so i left it trickling.

It replaced a 100 year old pull chain toilet with that with a copper cistern. it sadly was at the end of its life. there's no way the fiddly plastic parts in the new toilet will last 100 years, let alone 20.