ZeroWater: The Only Pitcher Filter That Removes Virtually All Dissolved Solids
ZeroWater (Philadelphia) makes the only pitcher filter on the US market with a 5-stage ion-exchange + carbon filtration system that reduces water TDS (total dissolved solids) to 0 ppm -- certified to NSF 53 for lead and NSF 42 for chlorine. While Brita and PUR use activated carbon only (leaving minerals, nitrates, and most dissolved solids in the water), ZeroWater's 5-stage design includes a dual-bed ion exchange resin that removes virtually all ionic contaminants. Every ZeroWater pitcher ships with a free TDS meter, demonstrating the brand's confidence in its claimed 0 TDS output.
ZeroWater vs. Brita vs. RO: TDS Comparison
| Filter Type | Output TDS (from 300 TDS source) | Lead Removed | Nitrates Removed | Cost/Gallon |
|---|---|---|---|---|
| No filter (tap) | 300 ppm | No | No | $0.001 |
| Brita Standard | 280--295 ppm | No | No | $0.10 |
| ZeroWater 5-stage | 0--1 ppm | Yes (NSF 53) | Yes | $0.25--$0.50* |
| APEC ROES-50 RO | 5--20 ppm | Yes (NSF 58) | Yes | $0.04--$0.06 |
* ZeroWater cost per gallon varies dramatically by source TDS -- high-TDS water clogs ZeroWater resin far faster than low-TDS water.
The ZeroWater Filter Life Problem in Hard Water
ZeroWater's primary drawback: filter life is heavily dependent on source water TDS. In soft, low-TDS municipal water (100--150 TDS), a ZeroWater filter lasts 25--40 gallons. In hard water (300--500 TDS), the same filter lasts only 15--25 gallons -- sometimes less. Annual filter cost in hard water areas can reach $200--$400 vs. $30--$50 for Brita Standard filters in the same household. For hard water households, ZeroWater's per-gallon economics are substantially worse than even premium Brita or a household RO system.