Low Potassium - Seachem Flourish Potassium ?

[Fatboy]

I just measured my potassium level, and I'm in less than 200 (maybe related to the fact that I'm using an oversize skimmer.... BK250). One alternative is to use Zeovit B-Balance strong but i find it a little bit too expensive. Has anybody tried to use Seachem Flourish Potassium to raise the potassium level ?

Seachem claims that Seachem Flourish Potassium is Soluble Potassium (K2O) at 05.8%