[julianbiggs]

Is the rain that falls from the sky pure ( 000 on a TDS meter ) until it hits the ground or anything that will contaminate it ?

Is it safe to drink pure water ?

[combat1]

I think rain water is around 15ppm and I think you can drink pure water if its from the RO and before it goes through the resin.
I may be wrong?

[Ian Lancaster]

Each rain droplet has to have a minute speck of dust for the water vapour to start to condense.  That immediately makes the TDS higher than 0ppm, though I don't know by how much - not a lot, I guess.  As the rain drops fall they pick up more contamination from the atmosphere - again airborne dust particles.  The TDS of freshly fallen rain must therefore depend on how dusty the air is.

As for drinking RO water - RO's were invented to produce drinkable water so the answer has to be yes.  Whether drinking it after DI is a good idea, I don't know.  Anyone care to try it and let us know the outcome?

[Total shine cleaning services]

it can fluctuate a little I sometimes measure it and the lowest I ever measured was 8ppm,sad I know!!

graham

[Window Washers]

I meassured rain water the other day sat on the floor in a carpark and was 13ppm, would defo not drink water after di, it drys your mouth throat and god know what else out absorbing anything it can back into itself as it goes.

after ro is perfecting find 100 gpd upto 300 gpd ro is a domestic water ro

[johnny bravo]

people who buy ro for drinking water do not use di  vessels ,    i havent seen them being used in websites selling drinking water   ro systems.