Choose Heating Chemicals from C & W Berry. A great range of heating chemicals for clearing debris or removing potential contamination from unwanted oils. Leading brand Fernox to assist you in challenges such as effectively cleaning a central heating system and Active 8 to remove sludge. With effective Adey to clean and protect and strong Calmag to inhibit sludge. Trade quality products for both trade and DIY customers, everything you need to get the job done.