Originally Posted by 
350RRC
				
			 
			There are issues such as mosquitoes laying eggs in stagnant water in 'funny' spouting that hatch into wrigglers in tanks, pollen in the wattle flowering season clogging everything, dust that naturally settles out of the air when it rains settling in the bottom of tanks, etc.
I've got 2x 22,500 litre tanks that get fed off a shed roof via a system that I made that takes all the dust and pollen out of what goes into storage. I'm not on the mains but could easily be if I wanted.
The mosquito prob is best dealt with by ensuring spouts drain completely after rain, i.e. they've got the legal fall or better.
It really isn't that hard to get to this stage, been about 5 years now with crystal clear water at my ponderosa.
Simonds would never be allowed to call collected water 'potable' because of regulation.
Pretty sure they wouldn't want to in any case.
cheers, DL