Sentinel X400 Sludge Remover 1L

By Sentinel Product code: 28178 Pack size: Each

£23.98 Exc. VAT £19.98

Product Details

High performance cleaner, specifically designed for cleaning older central heating systems. A non-acid treatment which restores circulation to radiators and pipework. Ruthlessly efficient formula shifts built-up magnetite sludge, eliminating cold spots in radiators and restoring proper heat distribution.

Technical Specification
Brand Sentinel
Manufacturer ID X400L-12X1L-GB
Safety Data Sheet click here
Type Cleaner
Volume (L) 1
Volume (ml) 1000
Container Type Liquid
Range Name X400
Delivery details

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery – £5.00 or FREE for orders over £25

  • Order before 7pm Monday to Thursday for next business day delivery
  • Order Friday to Sunday before 5pm for Monday delivery
  • Orders placed after Sunday at 5pm will be delivered the following Tuesday

Pre-12pm Delivery – £10.00 or £5.00 for orders over £25, to arrive before 12pm on the scheduled days above

Saturday Delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 6pm Friday)

Sunday delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 4pm Saturday)

Times may vary for items being delivered directly from the supplier. For more information, please visit our delivery information page below.

Items over 30kg can only be delivered from Monday to Friday. If ordered before 6pm, please allow up to two business days for delivery. Orders placed after 6pm Thursday will be delivered after the weekend.

More about Delivery
Click & Collect details

Collection Details

Our opening times are 7am-8pm Monday-Friday, 7am-7pm Saturday and 9-4pm Sunday. Please check your local branch is open on the branch locator page, before you visit.

Once you have placed your order online, we’ll have it ready for you at the branch you have selected in as little as 5 minutes. We will hold your order for 14 days, after which we will automatically generate a refund to the payment type you used to place the order.

Don’t forget your mobile number – Make sure your mobile number is added so that we can text you when your order is ready to collect. Please wait for your text or email before coming to collect your items.

If an item is eligible for Next Business Day Collection in branch, the order must be placed by 7pm Monday to Thursday for collection the next day. Orders placed after 7pm on Thursday, and up to 5pm on Sunday, will be available for collection on Monday. For larger items over 30kg, please allow two business days.

Sentinel X400 Sludge Remover 1L is rated 4.7 out of 5 by 35.
Rated 5 out of 5 by from Give this a try .. it does what it says it will do Having put Sentinel X400 into the central heating system .. the uniform heat of the radiators had improved noticeably within 24 hours. I left the remover in the system for x3 weeks .. then drained the system down so that each and every radiator could be removed and flushed out. The amount of debris and black sludge that came out of the radiators was unbelievable .. but so worth doing now that the radiators are so much more thermally efficient. Try it for yourself .. but just remember this is aimed at removing the sludge .. and not blockages caused by excessive limescale!
Date published: 2022-04-12
Rated 5 out of 5 by from Good product Reasonably priced, compared to other well known brands and does the job well.
Date published: 2021-10-17
Rated 5 out of 5 by from Excellent service Good sound service no probs
Date published: 2021-04-22
Rated 5 out of 5 by from X400 X400 sludge remover does whst it says
Date published: 2021-03-19
Rated 2 out of 5 by from It didn't. Going by our Magnaclean filter there wasn't any sign of the system being de-sludged, there wasn't any evidence of particles sticking to the magnet after two weeks. The water was dirty brown but it looked as if the pipes/sludge were being given a clean but not a clear out. Perhaps a power flush is the next job.
Date published: 2021-03-18
Rated 5 out of 5 by from Cold rads First time using this product turned all rads off then each back on in turn to force through been in a week now and all rads red hot time to drain and put inhibitor in
Date published: 2021-03-02
Rated 4 out of 5 by from Best sludge remover going.. Effective and long lasting.
Date published: 2021-02-28
Rated 5 out of 5 by from Brilliant! I can't recommend this enough, short of having to power flush our system I decided to give this a go. Left in system for 3 weeks running and all cold spots have gone in different radiators. Fantastic stuff!
Date published: 2021-02-06
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