Waterdrop MNR35 Remineralization Filter

The Waterdrop MNR35 remineralization filter adds healthy minerals back into reverse-osmosis water. RO systems strip out almost everything — including beneficial calcium, magnesium, and potassium. This inline mineral filter restores 18 natural minerals, bringing flat-tasting RO water back to a balanced, spring-like taste.

Key features

• 18 natural minerals restored — calcium, magnesium, potassium, and other trace minerals RO filtration removes
• 9–12 month filter life — roughly twice a year replacement
• 1/4″ quick-connect fittings — installs inline after any standard reverse osmosis system, no special tools
• Universal add-on — works with most under-sink RO systems, not just Waterdrop’s

If your RO water tastes “empty” or slightly acidic, a remineralization stage is the standard fix. Compare prices from every store above to get the MNR35 at the best price.