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Hi there. I have rephrased my original question so there is no confusion. I want to add a sludge remover to my rads and then a de-scaler and inhibitor. The water is manky when i bleed the rads plus i had a new dhw flow switch fitted in my combi (potterton puma 100e) cause the old one was...

Hi there. I looking for a bit of advice on how to flush my combi. I want to buy something like fernox,scalex or protex but i dont know how to put it in the system. ive heard i can put it in via a radiator but i would prefer to put it in the combi itself.Do i need a plumber? or is straight...