[Randy Holmes-Farley]

Potassium may or may not be an important thing to think about. There has been a rash of interest based on zeovit coming out with a kit and a supplement. But IMO the need and benefit is not yet well established.

The nonsense about realigning dipoles in the above discussion is utterly ridiculous. The penetration of visible light through a potassium-containing water solution is no different than one that does not contain any potassium ions.

The amount of potassium in any potassium permanganate or iodide supplement it trivially small.

For example:
Raising iodine from none to NSW levels (0.07 ppm) using potassium iodide raises potassium by 0.02 ppm, or 0.005% of the normal potassium level of about 400 ppm. So the amount added is just not important in any possible context. The water clarity effects from potassium permanganate come from the permanganate, not the potassium. It has an effect similar to ozone.

The Seachem Flourish Potassium is a fine way to add potassium if you choose to add it. But I've never heard even from the folks that are dosing potassium that it has impacted water clarity, and I can't really think why it would.