Hi you emaile your reply to me but on your email the reply bounced. I think
your email is misconfigured.
Brian

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"Andy Bennet" wrote in message
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On 10/02/2019 16:25, Brian Gaff wrote:
Does that stuff really work or just bung up the works?
Brian

Well it works in my system, it slowly descales any crud in the boiler and
instead of loud bangs every now and again you get a gentle fizzing sound
as the boiler reaches max temperature.