Gravity Water Filters
Gravity-based water purifiers are versatile, energy-efficient, and non-electric. In gravity water filters, water is pulled downward to pass through the dense filter media, making it contaminant-free and sent to the lower chamber. They are a highly effective solution for ensuring potable and crisp tasting drinking water. With its advanced filtration technology, it removes 99.9% of dangerous microorganisms, and further reduces contaminants such as lead, fluoride, PFAs and microplastics. This comprehensive purification process guarantees that your water is safe for consumption.
These gravity filters are BPA-free and independently tested and certified to rigorous NSF/ANSI 42, 53, and P231 standards for trusted, verifiable performance.
Fluoride Gravity Water Filter FAQ
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Gravity filters reduce fluoride only when fitted with a fluoride-specific cartridge — standard carbon elements do not address it. Some other brands require a secondary fluoride cartridge that hangs in the filtered water tank. The all-in-one Coldstream FTO Plus cartridge pairs a ceramic outer shell with a granular activated-carbon core and is independently tested to reduce fluoride along with a broad range of other contaminants.
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The ceramic outer shell handles bacteria, cysts, and sediment, while the activated-carbon core reduces:
- Fluoride
- Chlorine
- Lead and other heavy metals
- PFAS (“forever chemicals”)
- Microplastics
These claims are independently tested and certified to NSF/ANSI 42, 53, and P231 standards rather than relying on manufacturer self-testing.
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Yes. The Coldstream FTO Plus is an 8-inch gravity cartridge that fits Berkey and British Berkefeld housings, as well as ProOne and most other gravity systems. Unlike a separate fluoride add-on element, it reduces fluoride, chlorine, lead, PFAS, and microplastics in a single certified cartridge — and it needs no priming before use.
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The Coldstream FTO Plus cartridge is a drop-in replacement for discontinued ProOne gravity elements. It fits the ProOne Big, ProOne Big+, and ProOne Traveler+ housings and is made in the same UK factory that produced the original ProOne G2.0 elements. It is not compatible with ProOne pitcher or Scout models.
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No. The FTO Plus is ready to use out of the box — fit the cartridge, fill the upper chamber, and discard the first two tanks of water as a rinse. There is no soaking, pump-priming, or faucet-pressure step, which is a practical difference from many gravity elements that require priming before first use.
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Replacement timing depends on how many cartridges run at once. A single cartridge should be replaced every 6 months, two cartridges every 12 months, and four cartridges every 24 months. Most households run two cartridges, so yearly replacement is typical.
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No. Water poured into the upper chamber passes through the filter element into the lower reservoir using gravity alone — no installation, plumbing connection, or power. The slow flow is deliberate: longer contact time between water and filter media allows the media to reduce more contaminants.
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The ARMOUR is a 304 stainless steel countertop gravity system. The housing, spigot, and stand are stainless steel, making it BPA-free and almost entirely plastic-free — the filter elements themselves are about 95% plastic-free. It processes up to four litres per hour and ships with two Coldstream FTO Plus cartridges.
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Noticeably slower flow between chambers is the most visible sign the ceramic shell is loading up with sediment. Follow the replacement schedule regardless — 6 months per single cartridge, 12 months for two — since the carbon core's fluoride reduction capacity depletes on its own timeline, independent of flow rate.