Tap Water Filter able to treat approx 200 - 300L only fm my experience. Cost wise in term of amt of water treated, i think RO+DI is more economical, last longer and able to remove almost 100% of impurities and dissolved solid compare to DI only. The setback on RO+DI is huge amt of waste water generated and unable to know when has it exhausted (might release minerals back to water if continue to use). I am thinking of adding only 1 stage of RO(membrane only) to increase the lifespan of DI but waste water is my concern.
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