Rainbow HC-3315 High Capacity Auto Feeder


MANUFACTURERRainbow Products

  (4.5 out of 5 Stars on 2 Ratings)

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Product Description

The high capacity HC-3315 Rainbow chemical feeder is very durable and highly reliable. Intended for 1-inch hard plumbing installations. High capacity automatic chemical feeders work best with commercial applications.



  • Holds 15 lbs. of tablets.
  • Treats up to 20,200 gallons with Bromine.
  • Treats up to 97,600 gallons with Trichlor.


  • Dimensions: (H) 21-1/2 in. x (W) 8 in. x (D) 15 in.
  • Service Clearance: 22-3/4 in.
Tablet Capacity:
15 lbs.
Treatment Capacity:
Up to 97,600 gal.

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Ask a Question

Asked on 07/14/2015 by Mike Baker

Will using more trichlor tablets increase the stabilizer levels. How much stabilizer is in each 3 inch tablet? Is it possible to purchase trichlor tablets with less stabilizer in each tablet? Can stabilizer be chemically lowered?

Inyo Answer

Answered on 07/15/2015 by Product Specialist Lennox H.

Hi Mike, Using Tricglor will definitely increase the stabilizer level overtime, it does not state the level of stabilizer that is in the tablets. There is a product by Bio-Active called CYA Reducer that recently hit the market that will reduce the stabilizer level in pools if it becomes an issue.


Asked on 05/20/2015 by steven

I have a 3000 gallon spa using a Hayward chorine feeder. I'm always having problems with the top cover leaking. I'm looking for something is more durable and easier to work with. is it easy to hook up? Thank you

Inyo Answer

Answered on 05/20/2015 by Product Specialist Patrick P.

Hi Steven, I think this chlorinator may be overkill for a 3,000 gallon spa as it is intended for pools up to 96,000 gallons. I really like the Custom Molded Products Chlorinators and they are easy to hook up.


Asked on 03/17/2015 by Glenn

I have a 50,000 gallon pool. What would be your recommendation on an in line chlorinator ?

Inyo Answer

Answered on 03/18/2015 by Product Specialist Robert M.

Hello Glenn - The Rainbow 320 chlorinator can handle up to 70,000 gallons.


Asked on 08/15/2012 by Guest

The description for the Rainbow HC-3315 says that it is best for commercial pools. Does that mean that it would be too much Chlorine or a problem for a residential pool?

Inyo Answer

Answered on 08/15/2012 by Product Specialist Patrick P.

You may have to keep the dial turned down to the lowest setting. We would recommend the Rainbow 320 Inline Chlorinator for residential pools of your size.


Asked on 03/10/2007 by Guest

Is there a feedback mechanism that tells the unit the chlorine balance in the pool? Is this a way for me to automate addition of clorine to keep it always at the correct level? Or, just another place to put the tab aside from the the drain basket?

Inyo Answer

Answered on 03/10/2007 by Product Specialist Patrick P.

There is a dial on this unit which has a setting from 1-10 If you set the dial on 1 it will be letting the least amount of chlorine to the pool and if you have it set at 10 this would send the most amount of chlorine to the pool. So you can automate the feed of chlorine to the pool but you will still need to manually test your water. We do not recommend placing tablets in the skimmer basket because this high concentration of chlorine goes directly back to your pump and can cause corrosion to your pool equipment. If you do not go with the automatic chlorinator we would recommend at least going with one of our floating chlorinators so you do not damage your equipment you may view our floating chlorinators here http://www.inyopools.com/chlorinators_floating.aspx 

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Ratings Summary

Average Rating:   (4.5 out of 5 Stars)

Recommended: (100%) 2 of 2 customers would recommend this product to a friend.

2 Ratings 5 star:   (1) 4 star:   (1) 3 star: (0) 2 star: (0) 1 star: (0)

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The Most Helpful Review

1 of 1 person found the following review helpful:

   (4 out of 5 Stars)

Reviewed By: from Port Aransas, TX ()

Pros: Easy to Install

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   (5 out of 5 Stars) be careful

Reviewed By: from Saginaw MI ()

Pros: very dependable

Cons: no warnings about top ring failure when the unit is completely turned off

This is a great chlorinater. It kept up very well with the holiday crowd. I will advise that you do not want to leave both the inlet and outlet shut off for a long period of time with tablets in the canister. I found out the pressure builds up and the top ring will fail.

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