potassium vs BGA

I read a translation of Aqua-Planta 4-83 and 3-89, which discussed KCl/ K2SO4 and BGA growth. It was stated that adding 2 teaspoons K2SO4 in 300 liter water resulted in the disappearing of BGA 4-5 days later. I must say that before the treatment, plant growth was quite poor, whereas adding K2SO4 improved the plant growth.

So definately an uncontrolled experiments with imo major conclusions. But do you guys have any thoughts about this article? just a reflection of better plant growth? or is there indeed a direct role for K in the elimination of BGA?

I am sceptical.....

greets,

yme