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Product Details

High Performance Cleaner is specifically designed for cleaning older central heating systems. It is a non-acid treatment which restores circulation to radiators and pipework. Its ruthlessly efficient formula shifts built-up magnetite sludge, eliminating cold spots in radiators and restoring proper heat distribution.

Technical Specification
Brand Sentinel
Safety Data Sheet click here
Volume (L) 0.3
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 5 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 9pm Mon-Fri (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.
Sentinel X400 Sludge Remover Rapid Dose 300ml is rated 4.8 out of 5 by 14.
Rated 5 out of 5 by from Effective in reducing bolier noise from iron Boiler was very noisy. Plumber said nothing to be done short of changing the heat exchanger for £400. Old central heating system very black water from iron deposits. Partially drained system and used 2 bottles of x400 (for larger system). Bolier much much quieter.
Date published: 2020-02-12
Rated 5 out of 5 by from System clean Got recommended by a plumber to add this to my heating system
Date published: 2020-01-26
Rated 4 out of 5 by from Clear radiator Took a week to clear, working fine now
Date published: 2020-01-15
Rated 5 out of 5 by from X400 Worked really well to clean central heating before boiler replacement
Date published: 2020-01-14
Rated 4 out of 5 by from Does what it says on the "tin" so to speak. This does what it says. I wasn't sure how bad my system was and decided to get a couple of bottles of this as I have a large (16 radiators) system. The rads that weren't getting warm now get heated. Job done.
Date published: 2020-01-12
Rated 5 out of 5 by from Good product I put this into my old central heating system to sort out a prroblem with cold radiators. I also installed a Sentinel magnetic filter to help remove the iron oxide particles. I have used the two for long enough now to restore the heating to its original heat output. My system was so blocked that I will buy some more.
Date published: 2019-12-29
Rated 5 out of 5 by from Does an excellent job! Did a great job removing gunk, hot water is now hot and radiators are now perfect.
Date published: 2019-12-21
Rated 5 out of 5 by from Unblocked my CH Excellent product worked inside 1hr will use again for sure
Date published: 2019-12-06
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