John, just to be sure, "K" standing for Kalium ?

Took me ages to find out that pot. permanganate is the same as kalium
permanganate in Europe :blush:

Theo

"John Hines" schreef in bericht
...
"BenignVanilla" wrote:

I had roughly 3tspns. to my pond last week. This week, almost all of the
yellow is gone. *gulp*

Potassium is the last letter of NPK which is formula for fertilizer.