Upgraded 320 Pool Chlorinator Inline Feeder - Reliable Tablet

Our review looks at the Upgraded 320 Pool Chlorinator Inline Feeder, a replacement compatible with the Rainbow 320 model and aimed at pool and spa owners who want a simple tablet feed system. The bottom line: this chlorinator is best for backyard pools or spas that need a closed, circulating feeder able to hold either 11 large or up to 98 small chlorine or bromine tablets, and its strongest selling point is the practical combination of a sealed cover, venting plug and an adjustable control valve that make dosing straightforward when installed correctly.

Key Features

• Closed circulating system: The feeder uses a closed system to circulate water and deliver controlled chlorination while helping the pool filtration work efficiently.
• Flexible tablet capacity: It accepts 11 large or 98 small chlorine/bromine tablets so users can size dosing to pools or spas of different volumes.
• Sealed cover with gasket: The cover includes a white thickened gasket to improve sealing and reduce the chance of external leaks when fitted and lubricated properly.
• Top vent plug: A vent plug releases built-up gas from tablet reactions to avoid excessive internal air pressure and helps maintain consistent operation.
• Control valve and bottom drain: The included control valve lets you regulate or stop flow and the bottom drain allows quick discharge of remaining liquid for cleaning or winterization.
• Durable ABS construction: Thickened inner walls and oxidation-resistant ABS material aim to extend service life compared with thinner alternatives.

Who It's For

This chlorinator is well suited to homeowners and small commercial operators who already use a Rainbow 320 style feeder or need a compatible inline tablet feeder that can handle a broad range of pool sizes, from several thousand up to tens of thousands of gallons depending on feed type. It is a practical option for those who want a physical tablet feeder with manual flow control and easy access for refills.

It is less appropriate for users who need a fully automated chemical control system or who are unable to maintain weekly cleaning and lubrication; the unit requires periodic lubrication of the lid and valve and weekly hose/feeder cleaning to avoid blockages and corrosion. Also note reports of seal or valve issues following freeze events, so those in freezing climates should winterize carefully or choose a freeze-resistant solution.

Pros & Cons

Pros

• Accepts multiple tablet sizes, making dosing adaptable to a wide range of pool and spa volumes.
• Good sealing design with thickened gasket and vent plug to manage pressure and reduce leaks when maintained.
• Control valve and bottom drain simplify flow regulation and service tasks like draining and cleaning.
• Durable ABS construction with thickened barrel walls for improved oxidation resistance.

Cons

• Some users report seal or valve problems, especially after freezing conditions, so winter care is required.
• Requires regular lubrication and cleaning to maintain reliable operation, which is additional maintenance compared with fully automated systems.

Specifications

Model compatibility	Compatible with Rainbow 320 style chlorinator
Tablet capacity	11 large or 98 small chlorine/bromine tablets
Pool capacity range	Bottom feed: ~6,500 to 27,000 gallons; Top feed: ~18,000 to 70,000 gallons
Material	High-quality ABS with thickened inner wall
Notable parts	Top vent plug, control valve, bottom drain, 1/4-in feed hose
Included maintenance items	Lubricating oil and necessary accessories for installation

Our Verdict

The Upgraded 320 Pool Chlorinator Inline Feeder is a practical, value-minded replacement for users who want a tablet-based feeder with solid design features like a gasketed lid, vent plug and drain. It represents good value if you perform the recommended weekly cleaning and lubrication and take care to winterize to avoid valve or seal damage. Ideal for backyard pools and spas that need straightforward, manual dosing rather than full automation.

Frequently Asked Questions

How many tablets will it hold?
The feeder accepts 11 large or up to 98 small chlorine or bromine tablets depending on tablet size.

Does it include a drain and valve?
Yes, the unit includes a control valve for flow regulation and a bottom drain to empty remaining liquid for cleaning.

Is it easy to maintain?
Routine maintenance involves lubricating the lid and valve and cleaning the hose and interior weekly to prevent blockage and corrosion.