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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: jinky230 on May 06, 2006, 08:07:35 am

Title: what is tds of rain water
Post by: jinky230 on May 06, 2006, 08:07:35 am

guys had a mayor downpour on thursday night so got out the meter and tested the rain drops it showed as 18,
in our area  the water is 54

I always thought rain water was pure, maybe starts of pure but by the time it reaches us and went thru the stuff in the air it is up to 18

not bad if you could filter at 18 your resin would last you for ever

views appreciated
jinky

Title: Re: what is tds of rain water
Post by: adixon on May 06, 2006, 08:59:09 am

what is the pure to waste ratio with your water at a TDS 54 my area is 45 - 50 and told the waste would be 80% - 20% pure does this sound about right ?      thanks andy

Title: Re: what is tds of rain water
Post by: dai on May 06, 2006, 01:46:36 pm

Jinky, I have done this many times and had readings from 0 to 6ppm, I have even melted fresh snow in a plastic dish and was surprised to get a reading of 12ppm
During wet spells I have had rain coming off the roof downspout at 6ppm. I have never had readings any higher than this. Was your collecting dish or whatever contaminated? Dai

Title: Re: what is tds of rain water
Post by: Jeff Brimble on May 06, 2006, 01:51:21 pm

TDS measure solids (Total Dissolved Solids) if the rain doesnt touch any minerals it should be OK. Dont try collecting from a slate or tiled roof.