Actually I'm in the distribution business, and a number of my customers are service companies. Regardless, I'm very much into NOT suggesting useless "add-on" products that don't produce value for the homeowner. I'm happier selling products that work.
I appreciate your feedback. I attended a web session hosted by the manufacturer of those products, and was skeptical. I appreciate a good phosphate remover, and a good flocculant. I don't believe in "magic" products. 8)