My close coupled cistern has started leaking all the time, not just on flushing. I believe this is the seal between the bottom of the cistern and the siphon but should I replace the donut washer as well while I've got it off ?
but cistern bleach blocks (which are very good for removing limescale) do shorten the life of rubber parts.
If you have a ballvalve with a stem going through the bottom of the cistern, this might be a good time to change its rubber seal. Consider a new Fluidmaster or Torbeck filling valve and flusher, they are amazingly quiet.
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