Plumbing Questions? Ask a Plumbing Expert.
I wish you the very best in your business...your question however will not cover the engineering you need create a system where diseases are eliminated, especially indoors without the sun.
I doubt that you will want to spend the $500 I charge for such designs, but I will submit the offer none the less... lacking that, there is a wealth of data on google you can easily access.
There is a lot more involved than simple water circulation, You wil need CAD drawings of a proper set up, the drawings alone would take me a day.
Let me know what you think...