GrowoniX EX400 Reverse Osmosis Filter 400GPD

Growonix EX400 Reverse Osmosis System for 400 GPD

The Growonix EX400 produces 400 GPD of near-zero-ppm water and flows about 17 gallons per hour at a 2:1 ratio. It is built with dual o-ring fittings and a steel pressure gauge, so you can read system pressure at a glance. A manual flush valve lets you purge salts off the membrane. Flush it for 3 to 5 minutes after each use, and the membrane lasts much longer. Recovery runs at 33% and can be dialed back for lower-quality feed water.

Standard Green Coconut Carbon, KDF85 Upgrade Ready

This base unit ships with the standard green coconut carbon filter, an NSF61-listed block that handles chlorine removal. It carries 8,000 gallons of capacity, or 3,000 gallons of RO water at a 2:1 ratio. On chloramine city water or well water with iron and hydrogen sulfide, step up to the KDF85 carbon filter instead. Want more output in winter or on low pressure? Add a BP-1530 booster pump to reach 80 PSI and push up to 450 GPD. Higher TDS or colder water will lower production.

Key Features

• 400 GPD output: Flows 17 gallons per hour of near-zero-ppm RO water at a 2:1 ratio.
• Green coconut carbon filter: NSF61-listed block for chlorine removal, included standard.
• KDF85 upgrade ready: Step up to the KDF85 carbon filter for chloramine and well-water metals.
• Manual flush valve: Purges salts off the membrane to extend its life.
• Steel pressure gauge: Reads system pressure so you can track performance and filter condition.
• Dual o-ring fittings: Tight, reliable connections across the housing.
• Booster-ready: Pairs with a BP-1530 booster pump to hit 80 PSI and up to 450 GPD.
• Wide operating range: Runs at 40–105°F, pH 3–11, and 40–80 PSI feed pressure.
• Compact build: 14 x 7 x 21 in, 20 lbs, with 8,000-gallon carbon capacity.

Technical Specifications