Pentair Rainbow 300 Off-Line Chlorinator (R171016) – Automatic chlorine dispenser for swimming pool

Crystal-clear water, effortlessly

The Pentair Rainbow 300 is an automatic off-line chlorinator designed to maintain a stable disinfection level in your pool. No more frequent manual additions: the system gradually dispenses chlorine or bromine for constant and effective treatment.

A simple, reliable, and safe solution to keep your water clean and inviting all season long.

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Designed for large pools

Large capacity

• Can hold up to 11 large tablets

• Or up to 98 small tablets

• Suitable for pools up to 48,000 gallons

Perfect for large residential pools or some commercial installations.

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Closed-loop operation

The Rainbow 300 operates in a closed system:

• No external fumes

• No additional ventilation required

• Increased safety during use

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Easy installation

This off-line model connects to the pressure side of your existing filtration pump system.

Installation includes:

• 1/4" feed hoses

• Adjustable control valve

• Necessary fittings

Everything included for quick and efficient setup.

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Safety and certification

• NSF certified NSF

• Operating pressure up to 50 PSI

• Designed for safe and durable use

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Why choose the Pentair Rainbow 300?

• Eliminates frequent manual dosing

• Maintains a constant chlorine level

• Operates even during your absences

• Compatible with most residential systems

• Reduced maintenance

• Reliable performance season after season

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Compatible with

• Slow-dissolving chlorine tablets

• Bromine sticks

(Always use products designed for chlorinators to ensure optimal operation.)

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Simplify your pool maintenance

The Pentair Rainbow 300 off-line chlorinator is a smart choice to automate disinfection and reduce daily chemical management.

Order today and enjoy a clean, balanced pool that’s always ready for swimming.