Ray, I also did some research on Dynamic Descaler some time ago and the one from Hitek is the same product sold by HSS, the manufacturing head office is in America - Precision Dynamics, The uk office is
Dynamic Descaler UK Ltd.
Florence Road Business Park
Tel: +44 (0)1579 384584 / 384777
Fax: +44 (0)1579 384765
their website has several videos and some interesting information on the product.
Has anyone tried it in a Stanley boiler??