i have used x800 without a powerflusher, used it for a over night cleaning of rads, eg run the system over night then i come the next day to change the boiler. I add it bit by bit and taste it to see the acid left. I stop when it has not used up all the acid. You need to circulate it at the minimum temperature or with the pump on and the boiler off. I guess as there is no maximum time and the spec. sheet suggests that it can protect against corrosion implies I can just leave it in. If a sealed system (combi, or non-combi but with no F&E tank but with an expansion vessel either inside the boiler or external to it) you will need to add the chemical another way. Often a tall towel type radiator will do. Turn off the boiler. Bleed water from a radiator bleed point until the boiler pressure drops to zero. Take the whole bleed plug (not just the square headed bleed screw) out of the top of the radiator, syphon out 1.5 litres of water and replace with the chemical. Replace the plug, top up the system water to normal boiler pressure (say 1.3 bar if you don't know what that is). Run the system as above. You will still have to do a full drain down and repeat a few times as above. If you don't have a suitable towel type radiator you can get the chemicals in various "easy add" versions. I've never found these easy to use.

Removing corrosion/magnetite sludge: Sentinel X400 or x800? Removing corrosion/magnetite sludge: Sentinel X400 or x800?

The circulation pump of the system can be used to circulate the cleaning solution; however equipment which provides a more rapid circulation can provide a more effective clean. When using an external cleaning rig, the product can be dosed directly to the buffer tank of the rig (follow equipment manufacturer’s instructions). i have done the 1 hour with ch at full blast as well. a lot of power flusher are not better then ch pumps anyway" To clean an older system in accordance with BS 7593, this product should be circulated (preferably at normal operating temperature, with all valves open and the pump turned to maximum flow) for a minimum period of 2 hours or until satisfactory performance is restored. Use in conjunction with a powerflushing device to achieve a more rapid clean.If you want to actually dissolve the sludge you need citric which is sold for the purpose as Fernox DS40. The older type in the plastic tub is far better than the square cardboard box! Our mission is to make best practice solutions simple. To achieve optimum performance and reliability for domestic central heating systems, follow our best practice process of clean, protect and maintain whether you’re commissioning a new system or revitalising an old one.The benefits of adhering to this best practice include improved performance, increased energy savings, and longer system life.

Sentinel X800 Jetflo Fast Acting Central Heating System

Thanks for the link. I have run some searches which suggest that it may take up to 3 days to 'clean' a system that was non-powerflushed. I located the drain valve just outside the property and opened it to drain the central heating system - left it for about an hour When using concentrate gel, add directly to the heating system either via a radiator air bleed valve, or via the fill loop using the appropriate adaptor and a suitable caulk gun. Sometimes a more general clean is required, aimed at removing iron oxide and limescale deposits from pipework, heat exchangers and radiators. X800 Fast Acting Cleaner is ideal for these purposes, designed for use in conjunction with powerflushing equipment, but also proving a highly effective cleaner when manually flushed, too. It is effective both hot and cold. When might I need Deposit Remover?As for new systems, X300 Cleaner for New Systems is designed to target installation and manufacture debris and contaminants. Once cleaned, it will passivate the metal surfaces and prevent copper deposition. If a system has not been cleaned prior to use, all of the aforementioned issues for new systems will be present, with the installation debris causing issues and damage to the system. I bled the towel radiator in the bathtroom and then siphoned some water out so I could pour in 1L of Sentinel X800

Sentinel X800 - does it contain real magic? | DIYnot Forums Sentinel X800 - does it contain real magic? | DIYnot Forums

The Sentinel X800 Fast Acting Cleaner can be used in hot or cold systems (older than six months) and is the perfect partner for powerflushing machines thanks to its no-foam formula. I went upstairs and started bleeding the radiators there too which caused water to come out of the bleed valves on the radiators downstairs that I had left open

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This cleaning agent boasts a powerful yet non-aggressive formulation that helps installers to get the job done as fast as possible - without compromising on performance.