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Seen your useful comments of a few years ago. As an amateur (with some building experience) I have to repair a typical 1930 2’ flint wall made up of a 4” brick backing (bricks laid on their edge unfortunately – so not that strong!) holding back a 1½ ’ raised garden behind, with a flint wall...

Not so spooky really - After I used DS4 on my first boiler (around 1992) the dreaded banging came back in about 6-7 years, much like yours now! That was when I got a new boiler - in hindsight I wish I had persevered with it – prior to putting in the new one, they cleaned the system - and...

Largemoo (David/Tony & all) - Saw/read this thread as I have a ‘kettling’ problem starting with my 13 year old Ideal Mexico super8 RS80 floor standing boiler (gravity fed hot water, pumped c/h), but the piping/ pump/radiators are around 35 years old, h/w tank 20 y/o. This is the second...