Sentinel X400 System Restorer 1Ltr Product Code: 89458

1Ltr. Apply to existing systems for the removal of sludge and deposits. Iron oxide is broken down and dispersed through flushing.


  • Removes Sludge
  • Breaks Down Iron Oxide
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Safety Data Sheet
Additional Information
Technical Specification
  • Brand : Sentinel
  • Product Type : System Restorer
  • Volume : 1 Ltr
  • Model No : X400
  • Pack Size : 1
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
Product Contents
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

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Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


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€22.45 Incl. 20% VAT

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Sentinel X400 System Restorer 1Ltr is rated 4.7 out of 5 by 61.
Rated 4 out of 5 by from Sentinel X400 heating system r Works well particularly when used with an Adey Magna clean filter
Date published: 2019-03-27
Rated 4 out of 5 by from Does the job Had problems with my heating system. Managed to get the water moving round the system again and added some of this. Cleaned the system a couple of weeks later and works great now.
Date published: 2019-03-03
Rated 5 out of 5 by from Systems cleaning I needed to clean the heating system but wanted to avoid the time and cost of having the system power flushed. After reading the reviews I decided to give this a try, After switching the heating on again I noticed that after about an hour or so it was running a lot hotter through all of the radiators and it was so much quieter. I will leave it in for a couple of weeks before flushing via the filler loop and see what comes out of the system then. Early days but is looking good and in lime with the other reviews
Date published: 2019-02-11
Rated 5 out of 5 by from Good Stuff My heating system was nearly blocked solid and I mean solid,hardly any flow, after about 6 hours it was well sorted, all rads nice and hot, superb stuff, alternately you could fork out £££££££££ for a power flush.
Date published: 2019-02-01
Rated 5 out of 5 by from Sentinel x400 This is a great product my heating system was blocked no heat in any radiators put this in left it a couple of days then flushed it out heating working like new
Date published: 2019-01-25
Rated 5 out of 5 by from Good product, definitely helps I've been using this and other Sentinel products for over 20 years. When faced with poor circulation or pre-dosing before a Powerflush, this stuff does help a lot. I asked Sentinel Tech Help what exactly is the difference between X400 and X800? They told me that they both work in the same way but that the X400 can be left in for up to 28 days before it starts to deposit again (the sludge sticks back to the pipe walls etc. after 28 days or so) whereas X800 deposits within a shorter period (I think it was day or so) if left in as it's for flushing the same day and removing the same day as in a Powerflush. I like Fernox products too but I am leaning towards Sentinel when it comes to X400 pre-dosing or X800 during a flush. I think X400 is better than Fernox F3 and Sentinel X800 is better than Fernox F5 but that's just my opinion.
Date published: 2019-01-21
Rated 5 out of 5 by from Just the job! Fab product - does what it says on the tin - just the job!
Date published: 2018-12-16
Rated 5 out of 5 by from exactly what I needed as with all sentinel products they do as they say on the bottle, I never bother using another brand nowadays
Date published: 2018-12-07
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