Re: R/O Units

[Stuart Hall <sturob@swbell.net>]

You second two are correct; it's impossible that the waste water is 
exactly as hard as the tapwater.  UNLESS the R/O unit isn't doing 
anything, in which case the R/O water is ALSO the same hardness as 
tapwater.

I mean, 170 ppm solids can't still be 170 ppm in less water.  It'd be 
easy to figure out . . .

Say you've got tapwater that's 200 ppm dissolved solids (or 
whatever), and the R/O water comes out at 0 ppm.  You have three 
gallons of waste water for each gallon of R/O produced.  That comes 
to . . .

	(3 gallons / 4 gallons) * (200 ppm/gallon) ==>  266 ppm "waste" water

I didn't understand Z-Man's ratio, since he said, "I have a unit that
produces 25 gallons per day with "non-RO" water at 125 gallons ratio for
about seven years now."  I guess he means 5 gallons of waste for each 
gallon produced.  If the R/O is 0 ppm in his case, and the tapwater 
is 170 ppm, then we've got . . .

	(5 gallons / 6 gallons) * (170 ppm/gallon) ==>  142 ppm "waste" water

Conversely, if the waste really is 170 ppm/gallon, then his tapwater is . . .

	(6 gallons / 5 gallons) * (170 ppm/gallon) ==>  204 ppm tapwater



Stuart
-- 
Stuart Hall
(sturob@swbell.net)
(gasdocstu@my-deja.com)


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