That's a great idea about the rain water flushing.
However, in my case it's not really what I am looking for.
I have to pay for OUTGOING WATER. I get my water from my well, which is almost free (just costs the electricity to run the pump)
If I flush my toilet with rain water, I still have to pay the exact same amount to have the waste-water hauled away.
If I flushed my toilet with shower water, I am getting a SECOND use out of the shower water that I already need to pay to remove.
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