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Rain water only 5 ppm ?

eminor

Member
Joined
5 Feb 2021
Messages
274
Location
France
Hello, i live in a city with factory nearby, is it possible that the rain water ppm is so low ?

i tested the °KH it change color after 1 drop, so kh <= 1, it's better than the RO water i used in the past, the roof is in glass, maybe that's why ?
 

MichaelJ

Member
Joined
9 Feb 2021
Messages
1,161
Location
Minnesota, USA
Hello, i live in a city with factory nearby, is it possible that the rain water ppm is so low ?
I've tested my rain water a couple of times where I live. TDS came out very low as well (around 5 ppm, as I remember). If your rainwater is clean, it's close to ideal as a starting point for remineralization if you can collect and store it in a consistent manner. Those are big IF's however, but of course, you can always use rainwater when it's available and RO when not - say, during the summer where precipitation is low and in the winter where it might not be possible due to freezing etc.

Cheers,
Michael
 

dw1305

Expert
UKAPS Team
Joined
7 Apr 2008
Messages
13,049
Location
nr Bath
Hi all,
is it possible that the rain water ppm is so low ?
It is. Rainwater is naturally distilled so it will only pick up hardness if it is contact with <"limestone containing dust"> etc. Rain water is naturally slightly acidic from the small amount of dissolved CO2.
i live in a city with factory nearby,
The dKH test measures alkalinity, so that if the factory emission was sulphur dioxide (SO2) rich it would make the <"rain more acid"> and lower the alkalinity reading.

cheers Darrel
 
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