Perhaps I'm a DIY'er, but being a Chartered Engineer, & having worked as a design engineer for many years, I'm not completely devoid of intelligence in these matters.
The original post was to gain advice on a product. Please remember, that not every one who asks for advice on here are complete Luddites.
We used to have a retired boiler design engineer who posted on here under the names of Big Burner or Dr Drivel ( we liked that name as it was so appropriate ).
The things he used to say were so misleading that eventually the site had to ban him!
Merely having experience of designing other things does not make anyone an instant expert on boilers.
Treating dirt in boilers needs a considerable practical experience to know how to best do it and which chemicals to use in any particular case.
Tony