Reverse Osmosis Storage Tank, 4 Gallon

Description

The 4-Gallon Reverse Osmosis (RO) Tank is a durable storage solution designed for residential and light commercial reverse osmosis water filtration systems. With its 4-gallon capacity, this tank provides a reliable supply of purified water for drinking, cooking, and other household applications, ensuring clean, great-tasting water is available on demand.

Constructed with a robust inner bladder and a corrosion-resistant outer shell, the tank maintains consistent water pressure, prevents leaks, and protects your RO system from overworking. Its compact design allows for easy under-sink installation and compatibility with most standard 4-gallon RO systems.

Key Features:

• 4-Gallon capacity for residential and light commercial RO systems
• Durable inner bladder maintains consistent water pressure and prevents leaks
• Corrosion-resistant outer shell for long-lasting performance
• Compact design suitable for under-sink or small-space installations
• Compatible with most standard reverse osmosis systems
• Provides clean, great-tasting water on demand

Typical Specs

• Total volume: approximately 4 – 4.4 gallons (tank shell size).
• Usable water: ~3.0 – 3.2 gallons depending on pre‑charge and system pressure.
• Connection: Standard 1/4″ NPT fitting compatible with most RO systems.
• Pre‑pressurized: Pre‑charged (often ~7 PSI) to reduce installation prep.
• Max pressure: Typically ~100 PSI working pressure.

Compatibility

These tanks are compatible with most under‑sink 4–5 stage RO systems that use a 1/4″ connection and pressure‑bladder storage design. They can serve as direct replacements for older 4 gallon tanks or upgrades to boost storage.

Note: Actual usable water is less than the stated capacity because the bladder and air charge take up space — usually around 80% of total tank volume.

Maintenance Tips

• Air Pre‑Charge: Before installation, check and adjust the tank’s air pre‑charge with a gauge (tank empty of water) to the recommended level (typically ~7 PSI).
• Ball Valve: Use a tank shut‑off ball valve between the tank and RO system for easier maintenance and tank draining.
• Sanitize: Sanitize the tank whenever you change RO system filters or make major service changes.
• Pressure Checks: If the tank seems slow to fill or deliver water, verify its air charge — incorrect air pressure reduces usable output.