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Product Details

3 in 1 system protector. Dissolves contaminants to a minute size and floats in the system. Provides long term protection. Easy to use and add when cleaning is not appropriate.

Technical Specification
Brand Calmag
Safety Data Sheet click here
Safety Data Sheet click here
Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm £5 Free
Turbo usually Next Business Day before 12 noon £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£10 £5 Free

Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 10 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 8pm Mon-Sat (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Central Heating Cleanser / Descaler & Inhibitor is rated 4.8 out of 5 by 38.
Rated 5 out of 5 by from Easy to add to hearing system Added this after fitting replacement pump and seems to have lessened system noises down , , no kettling now .,and pump runs on half speed now.
Date published: 2019-04-09
Rated 5 out of 5 by from Central Heating Cleanser / Descaler & Inhibitor used this product after flushing out system after fitting new radiator .
Date published: 2019-03-27
Rated 5 out of 5 by from So far, so good! My central heating is 30+ years old. It recently developed a faint noise, always worthy of investigation. The header tank had a slime/sludge surface and the water was disgustingly black, despite having the whole system drained down and refilled, with an inhibitor, less than 2 years ago. I drained down the system again and cleaned the header tank. Refilled the system and added 1 litre of Calmag 3 in 1. All very straightforward. Noise immediately gone. Can't speak for its longer term value but no reason to doubt it.
Date published: 2019-03-10
Rated 5 out of 5 by from Absolutely brilliant product!!! I had a sludged up towel rail which despite removing and draining down the system kept clogging up -cheaper products tried and failed to resolve the problem. Used Calmag direct into towel rail left for 48 hours (neat) which cleared blockage and all is now well on my micro-bore system - when all else fails use this!
Date published: 2019-03-08
Rated 5 out of 5 by from Highly recommended Much like other reviewers here my system is quite old (22 years). It's still on the original boiler (Ideal cast iron heat exchanger) and most of the rads are original. Also, like others here, I've had sludge in the system and kettling in the boiler. There has always been an additive of one sort or another in the system but since 2013 I've been paying extra attention by using either Sentinel products or, more recently, Cal-Chem 3 in 1. A combination of Cal-Chem 3 in 1 plus a Spirotech SpiroTrap MB3 Magnabooster Magnetic Central Heating System Filter, fitted near the boiler, seems to keep the system cleaner now than it has ever been. I now just top up annually with the Cal-Chem (I don't routinely drain the system) and it keeps the water clear. I changed the circulating pump this week as the old one was getting tired and stopped working occasionally, BUT, internally the pump casing was as clean as a whistle. The new, Grundfoss pump, is as happy as Larry and the system is now working better than ever.
Date published: 2019-01-16
Rated 4 out of 5 by from Easy installed I put this in through my expansion tank as per instructions on bottle. Easy to do but will wait for a month or so before I can say it has worked or not. No reason to think at this stage to think it isn't working.
Date published: 2018-10-13
Rated 5 out of 5 by from great product im no plumber but have been using this for a few years now,drain system every year and add this,nice clear water in rads and quite running.
Date published: 2018-10-05
Rated 5 out of 5 by from Does what it says! I have a 30 year old 8mm micro-bore CH system and last winter a downstairs radiator furthest away from the boiler was struggling to get hot. I put this product into the system and within an hour the radiator started to get hot and you could actually hear the water running through the radiator and pipework. I have had no problems since and the rest of the system gets hotter quicker and is quieter.
Date published: 2018-08-29
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