Sentinel X400 Sludge Remover 1L

By Sentinel Product code: 28178 Pack size: Each

£23.98 Exc. VAT £19.98

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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 9pm 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 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-6pm Saturday and 9-4pm Sunday. Please check your local store is open on the store locator page, before you visit.

Once you have placed your order online, we’ll have it ready for you at the store 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 store, the order must be placed by 9pm Monday to Thursday for collection the next day. Orders placed after 9pm 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 47.
Rated 5 out of 5 by from X400: Gaviscon for your central heating My heating system probably hasnt been cleaned for over 20 years, I wasnt sure what product to buy, but as Toolstation stock the sentinel range I thought Id give it a go. I can be totally sure its made a huge difference as Ive been fitting some new radiators at the same time, however after fitting a radiator yesterday and flushing the system to remove the X400 for a long time, Ive certainly found the heating has been more effective, rads are hotter and the pump has been much quieter (usually it sounds like a Walrus with severe indigestion). I have some more radiators to fit next week so I might buy some more and do it again to try and really clean the system out. I tend to prefer Toolstation to the obvious alternative as I find the shop generally is a bit less busy and parking etc is easier.
Date published: 2023-02-08
Rated 5 out of 5 by from Effective cleaner Does what it says on the bottle, doesnt cause old sealed leaks to recur.
Date published: 2022-12-24
Rated 5 out of 5 by from New boiler - old system = flush and clean, industry standard Industry standard, not much more to say
Date published: 2022-12-15
Rated 5 out of 5 by from Improve Radiator Efficiency If you are looking to improve the efficiency of your radiators then this product works a treat. there is a noticeable difference in temp of our radiators within 24 hours.
Date published: 2022-11-20
Rated 5 out of 5 by from Just the job-at a good price We added radiators to quite an old system. This flushed all the nasties out, so hopefully will improve the heating system.
Date published: 2022-11-12
Rated 5 out of 5 by from Made a difference Works a treat. Made a big difference to a sludged up system with cold spots.
Date published: 2022-11-07
Rated 5 out of 5 by from Sentinel x400 Very good price and product would recommend
Date published: 2022-08-06
Rated 5 out of 5 by from Does the job, no effort Got a lot of neglected radiators cleared and hot again
Date published: 2022-05-23
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