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Poolweb Pool Automation Chlorinators sku: R171016
Rainbow Automatic Chlorine or Bromine Off-Line Feeder Model 300
  • Rainbow Automatic Chlorine or Bromine Off-Line Feeder Model 300

Rainbow Automatic Chlorine or Bromine Off-Line Feeder Model 300

By Pentair
Poolweb #R171016
Ships after Oct 26, 2021
$108.13 $108.13
Unit price per 

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The Rainbow Model 300 Off-Line Automatic Chlorine or Bromine Feeder will treat pools and spas from 12,000 to 48,000 gallons per day. This model 300 is freestanding and holds 11 large or 98 small chlorine tablets. The feeder uses large or small Trichlor or Bromine slow-dissolving tablets to make sanitizing your existing pool or spa easy and automatic. Plus, the Rainbow Model 300 installs easily on the pressure side of the pump, downstream of the filter and heater.

The Rainbow 300 Series will retrofit into existing pools or spas. They not only save time, but they also reduce manual handling of chemicals. The Pentair automatic feeders feature an external fine control valve that lets you adjust the feed rate to meet specific pool or spa requirements. The check valve protects the pump and heater from back-up of highly chlorinated water.

The Rainbow Automatic Feeders are completely enclosed systems, so no escaping fumes. with the simple, trouble-free design, no venting is necessary. They are top loading which makes it very easy to add chemicals. And extensions are available to increase tablet or stick capacity, in case you are away for an extended period.

These Pentair Automatic Feeders are NSF listed for public or residential use in swimming pools, spas or hot tubs using 1 inch Trichlor tablets and when used with a flow indicating device such as Rainbow Model R172080. Output rating for Bromine is not NSF certified for 300 and 320 Series feeders.

The Series 300 off-line feeders are for retrofit installations. For permanent installation in the return line, the Rainbow Model 320 feeders are available.


  • Off-Line Feeder for Retrofit
  • Treats 12,000-48,000 gallons per day
  • Holds 98 small tablets
  • Top-loading makes it easy to add chemicals.
  • Uses 1/4 inch feeder hoses, control valve and fittings.
Max Operating Pressure: 50 psi
  • Completely enclosed system
  • No special venting required
  • For slow dissolving tablets only

    Technical Specifications

    Poolweb Item #R171016
    Cross Reference #Rainbow #300
    Shipping Weight6.2 lb

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    Standard ground shipments may be delivered sooner depending on where you are located, and the shipping method used to ship your order. Combining multiple items onto the same order can change the delivery date and expedited shipping costs, especially if the other items are not available for immediate shipment. Transit time is calculated in business days and does not include Saturday and Sunday.

    Due to significant demand on swimming pool parts and equipment, we cannot guarantee out of stock items will be available for immediate shipment. If your order must arrive to you by a certain day, please contact us first and we will provide you with a more definitive shipping and receipt of your order.


    This item can be returned within 30 days of order. See return policy for details and how to place a return.

    Poolweb Guarantee

    This item qualifies for a one-year guarantee. Poolweb guarantees that the item you receive will function as advertised for one year. See the Poolweb Guarantee for more details.

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