An inline alkaline filter that raises RO water pH to approximately 8.4–9.3 and adds minerals for a smoother taste — the final stage in a countertop or under-sink RO system. Fits 1/4″ and 3/8″ tubing.

What it does

This alkaline inline filter raises the pH of reverse-osmosis water to about 8.4–9.3 and reintroduces minerals, improving taste and mouthfeel. It’s a higher-pH option than the 4-in-1 remineralization filter, for people who prefer a more distinctly alkaline profile.

The media blend includes calcite (calcium carbonate), far-infrared ceramic balls, alkaline ceramic, tourmaline, and magnesium media. Installed as the last stage after RO and a carbon (T33) polishing filter. This is a taste-and-mineral enhancement step, not a contaminant filter.

Key benefits

• ✓Raises pH to ~8.4–9.3 — a distinctly alkaline profile
• ✓Adds calcium, magnesium & trace minerals
• ✓Contributes to ORP reduction (a measurable water property)
• ✓Final stage after RO + carbon (T33)
• ✓300–500 gallon life (~3–12 months)
• ✓Fits 1/4″ & 3/8″ tubing

Adds / adjusts

Specifications

Installation & connection

• Install as the last stage, after the RO membrane and carbon (T33) polishing filter.
• Water enters IN, exits OUT toward the faucet.
• Select your tubing size; elbow adapters for 3/8″ are included.
• Cold water only.
• Replace every 3–12 months (300–500 gallons) depending on water.

Often used with