I have provided quite a few examples of where I feel this system gives very good efficiency, so obviously I am applying a standard that keeps failing your standard.

No, you are not providing a standard at all. Efficiency is a measure of something. What is it you are measuring?

Cluthing at straws FD. A question based on an assumption about my personal committment to recognise danger and to provide adequate checks to avoid a tragedy. Or is this what you would call a strawman.

No, I am just pointing out extra costs that you have not considered. Are you now going to need a large quantity of steel on this white elephant?

Yes Rec, there appears to be a growing band of hobbyists in Australia as well as the rest of the world. Also some serious test to get these systems running commercially are happening as well. Some already are running commercially but not on a massive scale. I believe these smaller enterprises are supplying boutique businesses such as small restuarants etc.

There is plenty of info on the net. I have read where these techniquies are being used successfully in countries with greater water problems than Australia.

I am very keen on the concept, in the same way I am keen on permaculture. I still intend to do a little build along when I start in about 6 months. i would love to see what sprint has as a set up.