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[APD] Re: High water evaporation

>Some will disagree with me, but in theory, if you use reverse osmosis water
>which is like laboratory standard of chemical purity.

Not even close.  Quality R/O membranes filter out about 95% of impurities 
such as calcium, magnesium, carbonates, sulfates, etc.  The exact amount of 
contaminants removed is going to depend on the type of membrane used and the number 
of gallons it has filtered.  Removal of 90-95% of impurities would be 
considered good performance for an R/O membrane, but would of course leave about 
5-10% of impurities behind.  For laboratory purity, you need to aggressively 
filter water.  R/O followed by a high quality deionization column would produce 
near laboratory standard water for most applications.  For absolute purity, the 
"gold standard" is double distillation, which produces essentially 100% pure 
water.  For aquarium use, such purity is wasted effort.  R/O water is certainly 
pure enough for anything you're trying to accomplish, and would still require 
minerals and fertilizers to be added if you want to use it for plants or fish. 
 Running straight R/O water on fish is never a good idea.  They do need some 
minerals in their water.

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