{"product_id":"sentinel-x400-sludge-remover-1-litre-high-performance-cleaner-for-older-systems","title":"Sentinel X400 Sludge Remover 1 Litre - High Performance Cleaner for Older Systems","description":"\u003c!-- SEO Product Name: Sentinel X400 Sludge Remover 1 Litre - High Performance Cleaner for Older Systems - X400 --\u003e\n\u003cdiv style=\"font-size:16px; max-width:900px; line-height:1.6; color:#1a1a1a;\"\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSentinel X400 Sludge Remover\u003c\/strong\u003e (MPN \u003cstrong\u003eX400\u003c\/strong\u003e) is a high-performance, non-acid cleaner specifically designed for \u003cstrong\u003ecleaning older central heating systems\u003c\/strong\u003e. It restores circulation to radiators and pipework by lifting and dispersing built-up magnetite sludge, eliminating cold spots and restoring proper heat distribution. X400 is ideal where a \u003cstrong\u003enew boiler or pump is being fitted to an existing system\u003c\/strong\u003e, or where radiators have cold areas caused by sludge build-up.\u003c\/p\u003e\n\n      \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:10px; margin:20px 0;\"\u003e\n        \n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e1 Litre\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003ePack Size\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e1% of System Volume\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eDose Rate\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eUp to 10 Radiators\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eCoverage\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e2 Hours\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eMin Circulation\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eUp to 3 Weeks\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eSuspension Time\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eNon-Acid\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eFormulation\u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"border-left:5px solid #008377CF; background-color:#e6f6f5; padding:12px 16px; border-radius:4px; margin:16px 0;\"\u003e\n        \u003cstrong style=\"color:#008377CF;\"\u003eDosage\u003c\/strong\u003e\n        \u003cdiv style=\"margin-top:6px; font-size:15px; line-height:1.5;\"\u003e\n\u003cstrong\u003e1 litre of Sentinel X400 treats a typical domestic system of 8 to 10 radiator panels.\u003c\/strong\u003e Larger systems should be dosed with 2 litres, at a rate of 1% of system volume.\u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"border-left:5px solid #b8860b; background-color:#fdf6e3; padding:12px 16px; border-radius:4px; margin:16px 0;\"\u003e\n        \u003cstrong style=\"color:#b8860b;\"\u003eCirculation Requirements\u003c\/strong\u003e\n        \u003cdiv style=\"margin-top:6px; font-size:15px; line-height:1.5;\"\u003eTo clean an existing system in accordance with \u003cstrong\u003eBS 7593\u003c\/strong\u003e, X400 should be circulated at normal operating temperature, with all valves open and the pump on maximum flow, for a \u003cstrong\u003eminimum of 2 hours\u003c\/strong\u003e or until satisfactory performance is restored. Where systems are \u003cstrong\u003ebadly fouled, a longer circulation period of approximately 3-4 weeks\u003c\/strong\u003e is recommended, and this product will not clear a completely blocked pipe.\u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"border-left:5px solid #008377CF; background-color:#e6f6f5; padding:12px 16px; border-radius:4px; margin:16px 0;\"\u003e\n        \u003cstrong style=\"color:#008377CF;\"\u003ePowerflushing Compatible\u003c\/strong\u003e\n        \u003cdiv style=\"margin-top:6px; font-size:15px; line-height:1.5;\"\u003eFor faster, more effective cleaning, X400 can be used \u003cstrong\u003ein conjunction with a powerflushing device\u003c\/strong\u003e. The product is not aggressive and can be safely left circulating in the system for extended periods where needed.\u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:12px; margin:20px 0;\"\u003e\n        \n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eRemoves Built-Up Magnetite Sludge\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eFormulated with a \u003cstrong\u003eruthlessly efficient formula\u003c\/strong\u003e that shifts built-up magnetite sludge from radiators and pipework, addressing the leading cause of cold spots in older systems.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eRestores Even Heat Distribution\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eBy clearing sludge from circulation, X400 helps \u003cstrong\u003erestore a more even heat distribution\u003c\/strong\u003e throughout the property, improving comfort and reducing energy waste.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eNon-Acid, Non-Aggressive Formula\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eUnlike acid-based treatments, X400 has a \u003cstrong\u003enon-acid formulation which does not cause pin-holing or leaks\u003c\/strong\u003e, making it safe for extended circulation periods.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eHolds Sludge in Suspension\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eOnce mobilised, the product \u003cstrong\u003eholds sludge in suspension for up to 3 weeks\u003c\/strong\u003e, which is particularly useful for pre-dosing before a scheduled flush or powerflush visit.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003ePrepares System for New Components\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eIdeal preparation before \u003cstrong\u003efitting a new boiler or pump to an existing system\u003c\/strong\u003e, helping to prolong the effective life of the new component by removing damaging debris first.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eSuitable for Aluminium Systems\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eA \u003cstrong\u003enon-acid formulation suitable for use in all types of indirect heating systems\u003c\/strong\u003e, including those containing aluminium components.\u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003ctable style=\"width:100%; border-collapse:collapse; margin:20px 0; font-size:14px;\"\u003e\n        \n        \u003ctr\u003e\n          \u003ctd colspan=\"2\" style=\"background-color:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; border:1px solid #008377CF;\"\u003eProduct Identity\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eManufacturer\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eSentinel (Sentinel Performance Solutions)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eProduct Name\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eSentinel X400 Sludge Remover (High Performance Cleaner)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eMPN\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eX400\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd colspan=\"2\" style=\"background-color:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; border:1px solid #008377CF;\"\u003eDosage\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eDose Rate\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003e1% of system volume\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eStandard Treatment\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003e1 litre per 8-10 radiator domestic system\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eLarger Systems\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003e2 litres\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd colspan=\"2\" style=\"background-color:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; border:1px solid #008377CF;\"\u003eCirculation \u0026amp; Application\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eMinimum Circulation Time\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003e2 hours at normal operating temperature, maximum flow\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eHeavily Fouled Systems\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eExtended circulation up to 3-4 weeks\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eSludge Suspension Time\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eUp to 3 weeks\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003ePowerflush Compatible\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eYes\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd colspan=\"2\" style=\"background-color:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; border:1px solid #008377CF;\"\u003eCompatibility \u0026amp; Compliance\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eSystem Types\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eAll types of indirect heating system, including aluminium\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eStandard Referenced\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eBS 7593\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eNext Step\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eDrain, flush, then treat with Sentinel X100 Inhibitor or Sentinel X500 Inhibited Antifreeze\u003c\/td\u003e\n          \u003c\/tr\u003e\n      \u003c\/table\u003e\n      \u003cdiv style=\"margin:24px 0;\"\u003e\n        \n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWhat is X400 designed to remove?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eIt is designed to remove \u003cstrong\u003ebuilt-up magnetite sludge\u003c\/strong\u003e from older central heating systems, restoring circulation to radiators and pipework and eliminating cold spots.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eHow long should I circulate X400?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eFor a minimum of \u003cstrong\u003e2 hours\u003c\/strong\u003e at normal operating temperature with all valves open and the pump at maximum flow, or until satisfactory performance is restored.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWhat if my system is very badly fouled?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eFor heavily fouled systems, a \u003cstrong\u003elonger circulation period of approximately 3-4 weeks\u003c\/strong\u003e is recommended, and using a powerflushing device will speed up the process.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eHow much X400 do I need?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003e\n\u003cstrong\u003e1 litre treats a typical domestic system of 8 to 10 radiators.\u003c\/strong\u003e Larger systems should be dosed with 2 litres.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWill X400 clear a completely blocked pipe?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eNo. This product \u003cstrong\u003ewill not clear a completely blocked pipe\u003c\/strong\u003e - it is intended for circulating sludge and debris, not resolving total blockages.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWhat should I do after using X400?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eDrain and thoroughly flush the system, then refill and treat with \u003cstrong\u003eSentinel X100 Inhibitor\u003c\/strong\u003e or Sentinel X500 Inhibited Antifreeze.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sentinel","offers":[{"title":"Default Title","offer_id":65282996437341,"sku":"X400","price":16.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/SentinelX400SludgeRemover1Litre.jpg?v=1784304372","url":"https:\/\/qualityheating.co.uk\/products\/sentinel-x400-sludge-remover-1-litre-high-performance-cleaner-for-older-systems","provider":"AIZO Quality Heating","version":"1.0","type":"link"}