I don’t think there is a great interest in water. As a Water & Sewer Engineer for a small shire, I did a house to house inspection of water tanks that people were using for drinking water (they did have treated town bore water, but with lots of dissolved minerals and a smell when warm). They were in an appalling state with mosquito wrigglers, algae, rust, organics like rotting leaves, frogs, possum & bird poo. Because town water was a “new thing” connected in the 1970’s most houses were still plumbed for tank water and people used it with confidence even if it was brown.
Councils maintain their water to the Australian Drinking Water standard, which may be better than bottled or tank, but perceptions are that bottled and rainwater are “healthier, more pure, more natural”. Cleaning out your rainwater tank regularly would go a long way to better water.
When we bought our property I paid the Council to do a water analysis, particularly has it had been through a severe drought and I was concerned that they had pumped dam water up to fill tanks (they hadn’t). It came back well within ADW standard. I would suggest testing first to see if you actually have a problem.
I would be interested in pH correction. We recently replaced our failed corrugated iron tanks with poly tanks, so the acidity (6.4pH) of the rainwater is not being altered closer to 7pH. This has resulted in our hot water copper pipes slowly turning our shower and vanity blue/green. Drinking this in large quantities may have adverse health affects, but it also slowly degrades our pipes. I have been looking at suspending marble chips in the tank. But interested in other solutions.
Also in-line water filters. Nothing fancy. These are the micro mesh filters that go between the rainwater tank and drinking water points or before the house pump. They collect the gunk. Every so often (when the water is slow) unscrew the plastic housing and remove the cartridge which is probably slimy with muck, dispose and put in a new one. Our latest one has silver oxides(?) that are supposed to kill water borne bacteria. I haven’t tested it.
Our previous house had a water softener - it was useless as the water was already soft. So despite the previous owners running it day and night and using lots of water & power back-washing and pumping, it did nothing. Another reason to first check if you have a problem.