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Sounds a good system and we should all be aiming at something like that. You may need to check out with the water authority about an acceptable change over system which connects with the mains. They are a bit funny about these things because of the risk of contamination. One bomb-proof method is to have a header tank with a ball cock.
Looks like a good system. [8D]One question though.Do you collect all the rainwater or does some still go down the drains? The reason I ask is because over the road from me they have built a new school with a sege? roof. It has gutters but the rain water is collected into a tank and recycled for the toilet system. There are no downpipes leading to rainwater drains and from what I can remember one of the other benefits was that the rates were also reduced. I think it was because the rain run-off did not use the normal rainwater drainage system which forms part of your normal rates. It may be worth checking the legislation as you may also be able to get a reduction in rates for the same/similar reasons.I will try and find out more details as it may be useful information.
With regards toilet flushing - it's also a nice idea to pop a brick in the cistern, or even better - invest in a duel flush system, so you can use much less water than a full flush.
Nice piece of work Andrew.I know that you have already made sure that the rain water cannot run back into the domestic system. I know that you have done this in several ways.However the water bye-laws a re stupid and prescriptive. I can't fit a tap outside my house without connecting not one, but two, non return valves in series with it. I gather this is because I might connect a hose (which I don't have) to it and the hose might somehow get to a higher pressure than the mains and the water might be contaminated and one of the valves might not work.Since they really are that stupid, I think you need to fit the aproved double non return valve just in case they decide to play silly buggers.I heard that those "double flush" cisterns went out of fashion because they typically used more water than normal ones. People used the "half flush" and, when that didn't do the job they used the "full flush". Net result 1.5 flushes where 1 would do.