HydroLogic® Stealth-RO™ 300 Water Filtration System - 300 GPD - 98%+ TDS Removal - 2:1 Waste Ratio

HydroLogic® Stealth-RO™ 300 Water Filtration System - Ultrapure Water for Hydroponics & Precision Cultivation

The HydroLogic® Stealth-RO™ 300 is a purpose-built, compact reverse osmosis water filtration system designed specifically for gardening and hydroponics. Removing 98%+ of all contaminants from tap water, the Stealth-RO™ 300 produces 300 GPD of ultrapure water with an industry-leading 2:1 waste-to-product water ratio — and an included optional 1:1 flow restrictor that saves 50% more water when efficiency is the priority. Everything needed for a complete installation is included right out of the box, including a Membrane Power Flush Kit for ongoing maintenance.

Key Features & Benefits

• 98%+ contaminant removal: Removes 98% or more of all contaminants from tap water, providing a clean, consistent baseline for precise nutrient solution preparation.
• Industry-leading 2:1 waste ratio: Produces 1 gallon of ultrapure water per 2 gallons of waste — significantly more efficient than systems running 3:1 or 4:1 waste ratios.
• Optional 1:1 ratio flow restrictor included: Reduce waste water production by 50% when maximum water conservation is required.
• Designed for hydroponics: Customized for growing applications with a garden hose connector, inline shut-off, and Membrane Power Flush Kit for easy system maintenance.
• Complete installation kit: Includes 3-stage RO unit, 2 RO membranes, carbon filter, cleanable sediment filter, automatic shut-off cartridge, wall-mountable metal bracket, garden hose connector, inline shut-off, 8 ft RO and drain line, 5 ft inlet line, filter wrench, and instructions.
• Weight: 12.5 lbs — manageable for installation and occasional repositioning.

Who Should Use This

Perfect for hobby to small-commercial hydroponic growers, indoor cultivators, and precision horticulturists who require consistent ultrapure water and want a complete, ready-to-install RO solution with minimal water waste and straightforward maintenance.

Compatibility

Uses the HydroLogic® Stealth-RO™ 150 & 350 Membrane Element (HGC741650) for membrane replacement. Upgrade to the KDF85 Catalytic Carbon Filter (HGC741622) for enhanced chloramine and heavy metal pre-filtration. Add the Stealth-RO™ Pressure Booster Pump (HGC728897) for low-pressure and well water applications. Dimensions: 18.5in x 16in x 6in.

Frequently Asked Questions

How much purified water does the Stealth-RO™ 300 produce?

The Stealth-RO™ 300 produces 300 GPD (gallons per day) of ultrapure water under standard operating conditions.

What is included in the complete kit?

Includes: 3-stage RO unit, 2 RO membranes, carbon filter, cleanable sediment filter, automatic shut-off cartridge, wall-mountable metal bracket, garden hose connector, inline shut-off, 8 ft RO and drain line, 5 ft inlet line, filter wrench, instructions, and a Membrane Power Flush Kit.

What is the waste-to-product water ratio?

Standard operation runs at a 2:1 waste-to-product ratio. The included 1:1 optional flow restrictor reduces waste water production by 50% when maximum water efficiency is the goal.

What replacement parts does this system use?

Replacement membranes: HydroLogic® Stealth-RO™ 150 & 350 Membrane Element (HGC741650). Pre-filter upgrade: KDF85 Catalytic Carbon Filter (HGC741622). For low inlet pressure: Stealth-RO™ Pressure Booster Pump (HGC728897).