My boiler is kettling, worse during warm-up than when up to temp. I cleaned the system with Sentinal X400 last year. The kettling died away after about 10 days. I flushed the system out afterwards, added X100, but the kettling started again almost immediately! Checked today and I have black sludge in the boiler.
I have another bottle of X400.
Can I add this to the system whilst the X100 is still in there or do I have to flush with water first?
Can I leave the X400 in for longer than 4 weeks to give the system a thorough clean?
Is the Sentinal stuff any good or is Fernox DS-40 better?
Mark.
I have another bottle of X400.
Can I add this to the system whilst the X100 is still in there or do I have to flush with water first?
Can I leave the X400 in for longer than 4 weeks to give the system a thorough clean?
Is the Sentinal stuff any good or is Fernox DS-40 better?
Mark.