Do I just pour in to header tank

I think the best idea is to drain system completely - I let it drain for a while then lifted the float valve to stop it refilling, once the flow stopped close the drain tap, add the Jetflow to the header tank, free the the float valve and then let it fill then bleed the radiators and run the system. How long you keep cleaner in the system depends on if your radiators weren't getting very hot - a day if you didn't, mine took three days for one problem radiator to work. Once you're happy you need to drain / run system and repeat several times to clear the cleaner. Add a system conditioner like Sentinal X11 keep in good shape.

Can it be used on plastic central heating pipe

Sorry for delay. I have some plastic pipe and it has not caused any problems.

Can this product be used on a car cooling system to unblock a clogged heater matrix?

It may do damage to engine and is not recocomended for cars

If I putted “x100 inhibitor” 2years ago can I add “x800 cleaner” to clean the system

I would drain out the existing water, put in clean water and add the x800 and run the system as usual for about a week, then drain all the dirty water out and refill with clean water and add new x100. They say it cleans within an hour - but that is for the professional plumber who can stand over it whilst it runs. If it is DIY, then you are not in a hurry to drain it down and get the job finished within the day.

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Description

⚡ Clean fast, heat smart—don’t let corrosion slow you down!

POWERFLUSH READY - Optimized for powerflushing to maximize system longevity and reliability.
EFFICIENCY RESTORED - Revives your heating system’s performance for lower energy bills and better comfort.
VERSATILE APPLICATION - Perfect for both hot central heating and cold systems—one cleaner, multiple uses.
ADVANCED CHEMICAL POWER - Unrivalled formula targets and dissolves stubborn debris with precision.
LIGHTNING FAST CLEANING - Clears corrosion and scale in just 60 minutes—no more waiting around.

Sentinel X800 Fast Acting Cleaner is a 1-litre liquid solution designed to rapidly remove corrosion deposits and scale from central heating systems within one hour. Its advanced chemical technology restores system efficiency by targeting debris, making it ideal for both hot and cold systems and perfect for powerflushing applications.

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