Waterdrop currently lists G3-N1CF for up to six months or 550 gallons, with a one-time price of $29.99.
Compatible systems
Waterdrop identifies G3-N1CF for G3-family reverse-osmosis systems including G3P600 and G3P800.
Life and capacity
The current published limit is up to six months or 550 gallons, depending on water conditions.
Current price
Waterdrop currently lists G3-N1CF at $29.99 one-time, with lower subscription pricing shown on some system pages.
Do not confuse the three G3P800 filters
G3-N1CF is the first-stage CF cartridge. G3-N3CB and G3P800-N2RO are separate consumables with longer intervals.
How to verify fit before buying Waterdrop G3-N1CF Replacement Filter: G3/G3P600/G3P800 Guide
Treat compatibility as a model-number decision, not a shape-matching exercise. Start with the appliance or system model label, then confirm the exact cartridge or replacement code listed by the manufacturer. Similar-looking filters can use different tabs, seals, RFID features or bypass interfaces, so a cartridge that appears to fit can still leak, restrict flow or fail to lock correctly.
For aftermarket replacements, separate physical compatibility from filtration performance. A seller can correctly state that a cartridge fits a refrigerator while the contaminant-reduction scope differs from the original filter. If lead, cysts, PFAS or another health-related claim matters, verify the exact replacement model in the current certification or performance documentation rather than assuming an OEM-equivalent claim set.
Compare recurring cost, availability and replacement risk
Replacement products should be evaluated over several service cycles. Multiply the current cartridge price by the realistic replacement frequency, add shipping, and check whether the same model is consistently stocked. A low first-purchase price is less useful if the cartridge becomes difficult to source or if replacement intervals are short.
Watch for vague phrases such as “uses certified media” or “tested to a standard.” Finished-product certification is stronger evidence than a statement about one component. For marketplace listings, clear manufacturer identity, exact model numbers, return policies and traceable certification reduce the risk of counterfeit-style or poorly fitting replacements.