Sanavia Carbon Block Filter
or 4 interest-free payments of $12.50 with Shop Pay
Free shipping · 60-day returns · 3-year warranty
Replacement carbon block filter cartridge for Sanavia reverse osmosis water filtration systems. Reduces chlorine, chloramines, sediment, VOCs, PFAS, and heavy metals for clean, great-tasting water straight from your tap.
Recommended replacement every 12 months depending on water quality and usage.
Features:
- High-capacity carbon block filtration
- Reduces PFAS, lead, mercury, and chemical contaminants
- Easy installation, no tools required
- Compatible with standard Sanavia RO housing
What this cartridge does
Carbon is the stage that deals with what dissolves rather than what floats. Chlorine, chloramine and the organic compounds that come with them pass straight through a sediment stage and are what people are actually tasting when they say their water tastes like a swimming pool. This cartridge is sold as reducing chlorine, chloramines, sediment, VOCs, PFAS and heavy metals including lead and mercury.
What it is up against here
The contaminants below are the ones this cartridge is sold as reducing, set against what EPA and EWG data actually show in water across DC, Maryland and Virginia.
- Chlorine and its byproducts
- Chlorine reacting with organic matter from the Potomac is what forms trihalomethanes and haloacetic acids. Across the systems we hold EPA data for, those two sit further above EWG's health guidelines than anything else measured — and they form in the pipes after treatment, not at the plant.
- Chloramines
- DC Water and WSSC both disinfect with chloramine rather than free chlorine, because it survives a long distribution network. It is also what gives treated water its flat, faintly chemical taste, and it is more corrosive to old household plumbing than chlorine is.
- PFAS
- EPA's most recent national monitoring round found PFAS in supplies across this region. EWG's health standard for PFOA is 0.09 parts per trillion, against a federal limit of 4 ppt that is not enforceable until 2029 — the gap between legal and safe, in one contaminant.
- Lead
- Lead does not arrive from the treatment plant. It comes off the service line and the household plumbing between the main and the tap, which is why two houses on the same street can test differently — and why the fix has to be at the tap.
Not sure which of these are in your water? Look up your city’s testing record.
When to replace it
Sanavia's guidance is to replace this cartridge every 12 months. That is a usage figure, not a calendar rule: a household of five in a hard-water area works a cartridge harder than a couple who are away half the year.
Carbon does not fail loudly. It does not clog or leak — it simply stops adsorbing, and the first sign is usually that the water starts tasting of chlorine again. If you can taste the difference, you are already past due.
Questions, answered.
Every 12 months under Sanavia's guidance, adjusted for how hard your household runs it. Heavier use, or water carrying more sediment, shortens it. The practical test is taste: carbon stops working before it looks used up, and returning chlorine taste means it is spent.
It is sold as reducing PFAS along with chlorine, chloramines, VOCs, sediment and heavy metals including lead and mercury. PFAS is the reason a carbon stage matters here specifically: EPA's latest monitoring round found it in supplies across the DC, Maryland and Virginia area, and EWG's health standard for PFOA is roughly forty times stricter than the federal limit that takes effect in 2029.
Both. The carbon block and the 800G ROCB cartridge are two stages of the same system rather than two options — they are replaced together, and the filter bundle is simply both of them at $25 less than buying them separately.
Yes. It is tool-free and fits the standard Sanavia RO housing, so it is a twist out and a twist in. Nothing needs to be cut, soldered or shut off at the main.