Learn · Comparisons
No filtration method is universal — each one solves a different problem. This page assumes you've read Water Filtration 101; if the terms below are unfamiliar, start there first.
| Feature | Carbon | Reverse Osmosis | Bottled Water |
|---|---|---|---|
| Primary Purpose | Taste, odor, chlorine reduction | Dissolved contaminant reduction | Convenience, portability |
| Dissolved Solids | Limited | High | Varies by brand |
| Heavy Metals | Limited–Moderate | High | Varies by brand |
| Fluoride & Nitrates | Minimal | High | Varies by brand |
| Ongoing Cost | Moderate — scheduled filter changes | Moderate — scheduled filter/membrane changes | High recurring cost |
| Environmental Impact | Low | Some reject water | High plastic waste |
General comparison based on documented performance characteristics. Individual results depend on source water quality, system maintenance, and specific product specifications.
Carbon vs. reverse osmosis
Carbon filtration is well suited to improving taste and odor and reducing chlorine or chloramine, but it does not meaningfully reduce dissolved solids, fluoride, nitrates, or heavy metals.
Reverse osmosis addresses that broader range of dissolved contaminants — typically reducing total dissolved solids by approximately 90–98%, depending on source water — but requires more maintenance, produces some reject water, and removes beneficial minerals along with contaminants unless paired with remineralization.
Neither is "better." Carbon solves a taste and odor problem. RO solves a broader contaminant problem. The right choice depends on which problem you actually have.
Reverse osmosis vs. bottled water
Bottled water quality and sourcing varies by brand and batch, and is often not transparent to the consumer — the label rarely tells you what's actually been tested for, or how recently.
An under-sink RO system produces water from a known household source, with consistent quality at the point of use, rather than relying on stored and transported product. Bottled water also carries an ongoing recurring cost and generates plastic waste with every purchase, while an RO system's cost is concentrated in the system itself and its scheduled filter replacements.
Any specific cost comparison — your household's typical bottled water spend versus a system and service plan — is worth working out with your own numbers rather than a general estimate, since actual usage varies widely by household.
A note on documentation
The figures on this page reflect documented performance characteristics — published specifications and recognized certifications such as NSF/ANSI standards. Where performance depends on source water quality or system maintenance, that dependency is stated directly. If you'd like the underlying source for any figure on this page, ask — we'll point you to it directly.
Back to Water Filtration 101 →Systems
Each one is built for a specific water condition — not to fill a price tier. If neither fits, we'll say so.
Built for most municipal water treated with standard chlorine disinfection. Addresses taste, odor, and sediment.
View systemBuilt for chloramine-treated municipal water, using catalytic carbon that standard filters can't match.
View systemService plan
One scheduled visit a year, handled. We check in at six months in your first year just to be sure everything's right — no guessing when a filter is due, no forgetting, no blame when it isn't.
See how the plan works