POWERclean Ultra Off-Line Chlorinator w/ Clear Glass Lid - 25280-300-000



Part # 25280-300-000

By Custom Molded Products

  5 Average  



Part # 25280-300-000

Alternate Part #'s 25280-300-000, 25280300000

Product Description

POWERclean ULTRA Off-Line Chlorinator

  • Designed to treat pools from 5,000 - 50,000 gallons
  • Holds (12) 3” Tablets or 5lbs. of 1” Tablets
  • Installs easily onto existing equipment sets
  • Larger hose than comparable brands
  • Comes with two mounting brackets and tubing as well as 3/4” fittings for hard plumbing.

Product Specifications

Large Tab Capacity:
Small Tablet Capacity:
5 Lbs.

?     Asked on 8/27/2019 by Poolside

Does this offline feeder have the chemical “feeder tube”shown on the manufacturers schismatic? #9 scroll down to offline one tab ultra The schismatic here doesn’t show it. Same product number... https://www.c-m-p.com/pool-products/pool-sanitizers/powerclean/powerclean-ultra/


A  Answered on 10/15/2019 by InyoPools Product Specialist Steve M.

Poolside, we apologize for the inconvenience, however, we have been unable to confirm this information with the manufacturer.

?     Asked on 8/2/2019 by features and questions

does this have a air bleed valve to remove any trapped air in the unit once sealed if not how do you safely remove the trapped air? what is the red tube above the control valve? what size hole needs to be drilled into the plumbing for the off line model? how does this model rate compaired to the Hayward and Pentair models?

A  Answered on 8/2/2019 by InyoPools Product Specialist Lennox H.

Hi. This unit does not have an air bleed valve. The red tube is the Flow Control assembly. A 3/4" hole is required for the hose clamp. The features on the CMP units give it a higher rating than the other manufacturers.

?     Asked on 5/18/2019 by Stacie

Will this work with our above ground pool? Also, our current plumbing is all standard pool hose- what do I need to do/change in order to I stall this chlorinator?

A  Answered on 5/29/2019 by InyoPools Product Specialist Michelle B.

Hello, This will be a better option for your pool.http://www.inyopools.com/Products/23300007061785.htm

?     Asked on 1/28/2019 by Mark Ayash

I am looking at off-line chlorinator and was have had a couple Hayward fail and heard about these..Would this be a good fit for a in-ground pool around 20K.

A  Answered on 1/28/2019 by InyoPools Product Specialist Lennox H.

Hi, Mark. Yes, this unit will be sufficient for a 20K in-ground pool. 

?     Asked on 6/28/2016 by

Which is better in controlling the pool chlorine level? In-line or off-line? I have a two speed pump that runs all the time. Thanks.

A  Answered on 6/29/2016 by InyoPools Product Specialist Alan M.

There is not an advantage to controlling chlorine with either the in-line or off-line models. The chlorine levels are regulated by the control knobs that increase or decrease the amount of chlorine administered.

?     Asked on 5/29/2016 by Barbara

I have a Hayward chlorinator and have had lid issues with all of them... how is this unit different and will I have the same issues. The lid or cap will not close and water leaks out of it.

A  Answered on 5/30/2016 by InyoPools Product Specialist Alex V.

Barbara, Have you replaced the o-ring? The o-ring is usually the cause of leaks. You will have the same issue regardless of manufacturer since chlorine is very corrosive.

?     Asked on 4/8/2016 by Bob

Does this unit use the same size tubing and fittings as the Hayward CL220 which is what I have now but am not happy with?

A  Answered on 4/8/2016 by InyoPools Product Specialist Alan M.

Hi Bob, The POWERclean Ultra Off-Line Chlorinator uses larger hose than comparable brands like the HaywardCL220. The Chlorinator hoses are 1/4" larger.

?     Asked on 4/2/2016 by David

The control valve has indicators of 0, .5 and 1. What is the correlation to how much chlorine is sent to the pool?

A  Answered on 4/4/2016 by InyoPools Product Specialist Hector F.

The most standard way to use the usual 99 percent trichlor tablet is based off of the 1 tablet per 5 thousand gallon ratio. As long as you follow that standard then you can have the chlorinator at max output which in this case is 5.

?     Asked on 9/2/2015 by Carolyn Williams

How much larger are the hoses than th Rainbow 300C

A  Answered on 9/7/2015 by InyoPools Product Specialist Lennox H.

Hi Carolyn, The POWERclean Ultra Off-Line Chlorinator hoses are 1/4" larger than the Rainbow 300C Chlorinator.

?     Asked on 2/28/2013 by Guest

Can the Powerclean Ultra chlorinator be used on a home water purification system?

A  Answered on 2/28/2013 by InyoPools Product Specialist Patrick P.

I wouldn't recommend using the Powerclean Ultra chlorinator on any system that has pressure above 35 psi.

?     Asked on 1/30/2012 by Guest

What is the difference between an inline and offline chlorinator?

A  Answered on 1/30/2012 by InyoPools Product Specialist Patrick P.

An inline chlorinator would be plumbed directly inline with the plumbing.  For an existing pool, this would mean a section of pipe would need to be cut out to install the chlorinator.  An offline chlorinator attaches to existing plumbing by chlorinator tubing (holes would be drilled into existing pipe to attach the tubing.)


Est. Repair Time

Less than 1 hr

Tools Needed

Screwdriver, Nut Drivers, Pliers, Drill


Written on 3/25/2019 by Guest

1) Place unit on pad near the pump for permanent location
2) Mark where 4 holes are to be drilled into concrete pad
3) Use concrete drill bit size appropriate for the concrete screws you use
4) After drilling holes, place base over holes making sure that it is facing in the proper direction to allow the chlorinator to flow properly
5) Locate where you are to attach the lines into your existing plumbing.
6) Using a 3/4" drill, drill the respective holes, making sure that you clear all the debris away from hole and any that fell inside the pipe.
7) Attach the heavy duty clamps provided. I used the additional clamp adapters so that it would fit over the smaller pipe.
8) Attach the lines as instructed, making sure that you don't overtighten anything.
9) As a final note, make sure that the cap on the chlorinator has enough clearance from your pipes, that you can unscrew it without having to take everything apart. I made the mistake, not accounting for the little "wings" that were on the cap. I ended up having to relocate the chlorinator so that I would have proper clearance.
10) It works great, with no leaks!

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