Hi Fish, Maxi crop can be bought as a liquid or dry.
Here's an analysis at .5, 1, 2.5 & 5 tsp, respectively, per gallon of water:

pH 7.63 7.33 7.21 6.89

Conductivity (mS) 0.56 0.75 1.6 2.1

Alkalinity (ppm) 123 150 265 350

Nitrate-Nitrogen (ppm) 32 69 176 370

Phosphorus (ppm) 0 0 1 1

Potassium (ppm) 113 150 500 714

Calcium (ppm) 28 25 33 35

Zinc (ppm) 0.2 0 0.2 0.3

Copper (ppm)0 0 0 0

Iron (ppm) 0 0 0.1 0.7

For an extra boost of some 'natural potassium'... I add banana peels to my media beds. The worms love it.