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140 million liters of water down the drain
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helius:

--- Quote from: BrianHG on July 29, 2022, 09:33:11 pm ---A third party reviewer on multiple water filters and their quality:

--- End quote ---
I generally like his tests, but I found that one disappointing. Maybe it's a question of "how much you know" about subjects involved.

The main problem is that TDS (total dissolved solids) is not a gauge of water quality. Different filters have different aims, but the common goals are to eliminate turbidity, volatile odors, microbiological contamination, and toxic elements. Measuring TDS doesn't tell you anything about these. For example, a filter that does nothing except remove sodium will show a great improvement in TDS while not improving water quality at all.

The view inside the different filters is revealing, though. An RO filter is just a membrane folded and packed into a box; RO filters can be very good but they require multiple stages of prefilters because they get plugged with sediment easily, which increases cost. The carbon filters he cuts apart contain loose activated carbon granules: this design is a problem because loose granules get pushed around as water flows and open "channels" where very little filtering action can happen. Better filters impregnate the activated carbon with sticky resin so that everything stays as a solid block.
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