johnm1 wrote:
I'm confused where the concern is about contaminating the fresh water tank. Now please, I do understand that you don't want to mix grey or black water into your fresh but, the fresh water is already plumbed to the toilet from the factory. As long as one uses the proper parts and does a proper install, it should pretty much be no different than what's already there.
It's different in that there's an actual solid connection between grey and fresh. As originally installed, the fresh connection to the toilet is basically a nozzle at the back of the toilet that sprays water--so, while bacteria could get in there, it's not as likely as when there's a ball valve that rotates and causes, without a doubt, grey water to touch the fresh water line.
The issue, really, is will bacteria travel all the way to one of your drinking faucets or otherwise contaminate water that you will consume orally? IMHO, the answer is that the risk is trivial. Certainly it is significantly lower than other risks we all take every day wrt bacterial contamination.
