I'll begin by mentioning that through my reading here I understand that copper is not something that should be added to the pool (risk of stains/green hair). I am an employee at a local pool dealer looking for more insight as to the differences between copper sulphate algaecide in liquid and granular form. Another local pool company carries what is called "C-Pool", which I've determined to be copper sulphate in granular form, although I am unsure of the percentage (I believe ~4%). We carry two liquid algaecides that contain the same ingredient (Algae Free and Algae Master), with 1.7% and 3.3% copper sulphate respectively, both 1L bottles.
How do these compare to their granular counterpart in terms of potency and their likelihood to cause staining? Our company boycotts this "C-Pool" but sells the liquid counterpart despite their discouraging of C-Pool?
Thanks for any clarification, long time lurker.