Thanks, I did buy it from Germany through Amazon.de yesterday, 2 lbs bottle. Couldn't find it anywhere in Sweden, only sodium bicarbonate, so that was why I tried that first.
Hope it will be less shocking for the plants!
But I can't see the PM anymore on the stems, which is wonderful! But the bigger leaves wilted away and had to be discarded, the younger leaves are OK, so the plants look line amputated seedlings now, ha.... so I look forward to the potassium bicarbonate to avoid that side effect