When I was reading this thread I was trying to come up with a way. All I could come up with was to use the city water flow as a power source to pump the rain water...sort of like a turbo charger if you know what I mean.
I do like osolemio's setup.
As far as filtration for the rain water, how about building a filter box before the water enters the cistern? One could maybe use furnace filters laid in as slats, pull out occasionally to toss the bulk junk away, and replace when the filter box won't flow enough and overflows through a top relief pipe elbow.
|