Plumbing, Heating and Pool Repair Guides

Rainbow In-Line Chlorinator


The Rainbow In-Line Chlorinator is one of the many great products in the Pentair inventory. Pentair has products on thousands and thousands of swimming pools all over the world, especially in the United States. These In-Line Chlorinators are perfect for swimming pool owners who don’ have a lot of time to take care of their swimming pools.Rainbow In-Line Chlorinator

The Rainbow In-Line Chlorinator is available in 2 series the 300 and the 320. These chlorinators work great on large residential swimming pools and even large commercial swimming pools. The capacity of these In-Line Chlorinators range from small pools to pools that can hold 332,000 gallons of water.

Keeping up with your swimming pool’s needs can be time consuming but these In-Line Chlorinators are automatic and they are as easy as 1-2-3 to use. Simply use the slow dissolving sticks or tabs of chlorine or bromine. Why should you use these automatic pool sanitizers? Let’s take a look at the Pentair Rainbow In-Line Chlorinator and see the features and the specifications of these chlorinators.

Rainbow In-Line Chlorinator Features

Some of the features of the Rainbow In-Line Chlorinator are the two different series the 300 and the 320 have a clear amber filter that makes viewing the salt levels easy. There is no more taking apart these products just to see if it is working or not. These systems are 100% closed; you won’t need any venting system either. Now you can avoid that blast of chlorine when you open some of the other in-line chlorinators.

The 320 Series can be used for permanent installations in your swimming pools return lines. It doesn’t matter if you are using this system on an existing swimming pool or a brand new installation. This chlorinator can be installed on the pressure side of the return line of the pump. It uses a standard 2″slip PVC fittings and it uses an 1-1/2″ adapter.

Rainbow In-Line Chlorinator Specifications

Rainbow In-Line Chlorinator
This system offers a capacity to hold 11 large or 98 small tablets. This system can treat about 6500 gallons of water to 27,000 gallons of water. The 320 System can treat 10 ppm at 6,700 gallons of water for bottom feed and 17,500 gallons of water top feed. This system is very compact and won’t take up much room at all. It measures in at 17-3/4 in height x 5 in width x 10 in diameter. It is worth mentioning that if your swimming pool has any copper plumbing it would not be a good idea to install this system.

This In-Line Chlorinator will save you a lot of time and money. Since these are automatic sanitizers you will have to fill the chlorinator once a week and let the machine do the work for you. These are free standing models or they can be installed into your swimming pool lines. You can adjust the control valve to add more chlorine or less. The idea that you control the levels is great. The top loading system makes this system easy to use.

You won’t have to turn any product upside down to get the tablets in, just simply twist the top off and place the chlorine or bromine in and twist the cap back on and forget about it. There are feeder extensions available if you want to add more tablets for longer periods of time. These are great for vacations or when you know you will be too busy to take proper care of your swimming pool.

There are many In-Line Chlorinators out there on the market. It would be a good idea to shop around and compare the Rainbow In-Line Chlorinator with other brands and see which style works for you. Take into consideration the style of the feeder and how much they cost. Remember if you have copper plumbing it is best not to install this feeder. The price on this In-Line Chlorinator is about $72.95; you may be able to find it for less if you call your local swimming pool supply store.

The Rainbow In-Line Chlorinator offers an easy to use system that is affordable and dependable. Pentair has a great line of products that are high quality and high performance. Do some comparative shopping and choose the style of chlorinator that works best for you and your swimming pool needs.


  1. I have this chlorinator on my pool I have had for 5 years. I have had a problem with algae this year unlike any other! I have just noticed that part of the time my chlorinator isn’t filling with water and dispersing chlorine! I can take off the top and it fills with water quickly, and I put the top back on. But I can go back later and check it and there’s no water in it. Any ideas as to what could be causing this? Please help!! Can’t afford to keep treating for algae!!

    • Hi Cheri,

      It’s time to replace the Chlorinator, Its not worth trying to fix it because the parts would be more then the new one.

      Hope this helps and let me know if you have any more questions


  2. I want to install a inline chlorinator but do not know where to install it. What lines should it go on? I am a plumber so the work would be easy just dont know where it’s supposed to go. Thanks>

    • Hi Rob,

      The Chlorinator gets installed on the discharge side of the pools filter system otherwise known as the return line. The chlorinator gets piped in after the filter and after the heater if you have a heater. If you have a heater you will also want to install a check valve after the heater but before the Chlorinator.

      Let me know if you have any more questions. I hope this has helped you.


  3. Does the chlorinator take the place of shocking the pool once a week also? Do i have to add liquid chlorine any more?

  4. Just replaced a hayward with an inline rainbow clorinator, the system adds too much clorine even when set to the 1st division on the dial. The pool is 20,000 gal. the clorine level reads about 7 ( just a guess as it is beyond the reading of my test kit.) Called the factory and they were of little help. They suggest only using 3 or 4, 3 inch tabs, instead of the 7 tabs I was using. The reason for a automatic unit is to allow long unattended use I thought. I am thinking of modifing the input line diameter before the control valve with some type of reducer. What do you think?

    Gale Dickson

  5. Youre so cool! I dont suppose Ive learn something like this before. So nice to search out any individual with some unique thoughts on this subject. realy thanks for beginning this up. this web site is something that is wanted on the internet, somebody with slightly originality. helpful job for bringing something new to the web!

  6. I have copper plumbing to and from my pool underneath the concrete, but I have PVC for all equipment. The return line (which is copper) would only be a foot or two before the outlet line of the chlorinator. Is this bad for the copper, or will it be diluted enough as to not harm the copper?

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