Please explain why some water distillers use carbon “pre-filters” while some use carbon “post-filters”. Is one method better than the other?
All “batch” or “manual” distillers use some type of “post-filter”, a filter placed AFTER the distillation process. Since these types of distillers cannot be hooked up to a pressurized incoming water source, an input carbon filter is impractical. Fully-automatic water distillers which can be attached to a pressurized home water supply usually come with some type of carbon “prefilter”, filtering organic and volatile chemicals out of the incoming water prior to the distillation process. Still other distillers use both a carbon prefilter and post filter. From a technical, water purity standpoint, the most efficient location for a carbon filter is BEFORE the distillation process for several reasons: (1) in all types of water purification systems, successive sets of equipment are designed to improve on the preceeding quality of water processed by the system. Carbon is less effective, overall, than distillation as it relates to water purity and therefore preceeds the distillation process whic
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