i want to flush my radiators but before i take them off to use pressure washer i want to put some sludge remover thorugh the system as some radiators take an age to heat and some are barely warm across the bottom.ive tried bleeding them but all i geti is water coming out and no air.i want something that can be put in system through one of the radiators

A choice of Fernox DS40 or Sentinal X400. You have to be careful that you do not get leaks after use.

DWD

I wonder, if you are going to remove the rads, chemical cleaning will cause the sludge to emulsify and pass around the whole system, it does not magically disappear only becomes more fluid to drain out. If you are prepared to remove the rads to power flush them I would consider doing that 1st (be sure to have containers to catch the muck and plenty of old towels as it contains irons and stains the devil on carpets, a couple of blanking plugs would be best whilst getting them outside without a trail of drips, been there done that). Then, after getting the system running again, chemical clean leaving it in for a couple of weeks use, before draining and flushing and ultimately inhibiting.

just ordered the x400 1ltr part of double pack with x100 inhibitor with screwfix at a good price how much of the 1ltr do i use of both

Full instructions come with pack, usually enough for 3 to4 bed house size system. Not sure how long they recommend to leave in but my local Plumbers told me 2 weeks to a month and this worked good to rid boiler knocking as well, but a good few flush operation before I was happy to put inhibitor in.

I put in some Sentinal in my system yesterday and it says to put it in for 1 hour or until the system is working properly. Still waiting....

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Mike
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Leave the X400 in for a couple of weeks before flushing it out.

It is not designed as a quick flushing agent. For a quick job you should have got X800 which takes about an hour.

Use all of the litre bottle you have of both of them.

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Dave

www.drlgas.co.uk

cheers lads