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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.
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  • 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.
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Central Heating Cleanser / Descaler & Inhibitor is rated 4.8 out of 5 by 33.
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
Rated 5 out of 5 by from as a cleaner and system protecter it takes awhile to work ok
Date published: 2018-07-14
Rated 5 out of 5 by from descaler Great product.does exactly what it says on the can.
Date published: 2018-06-26
Rated 4 out of 5 by from Useful product I've used this plenty of times. It's not as good as doing the job properly, flushing with cleaner, draining and then filling with inhibitor, but if you are in a rush, or feeling lazy, it seems to be a good cleaner that also acts as an inhibitor, so no draining necessary.
Date published: 2018-06-24
Rated 5 out of 5 by from To early to tell Delivered next day. Added to system after new rads installed. OK so far but in reality It's too early to tell.
Date published: 2018-05-31
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