On Sun, 12 Mar 2006 21:18:26 GMT, €“ Colonel €“
wrote:


What is there in diluted
urine that will cause the lime to to precipitate out of solution and
stick to the porcelain?

Ammonia. Raises the pH, thus the precipitate.


Sounds right. I think I have a possible solution and that is to
squirt a little dishwasher soap into the standing water. That should
keep the precipitate in soultion or in suspension until the next
flush.