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Distilled water is only as good as its pre filter source & the type of source water you have. They do not work as well if you are using surface water that is hard. Trust me I own a good one 1 had to give up on it . too many issues & then there was the stainless steel tank that tasted a little funny. And yes r/o have problems also. regular filter changes are needed but run fairly consistent & do not need electricity to run. They will also beat the pulp out of even a good still in production. But given the right conditions & softer water with proper pre filters they will yield a purer water. 99.9 verse 97-99 % pure in r/o but that will depend on how good the stills pre & post filters are. Also an r/o membrane can last a long time, maybe years pending on usage.
 
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