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Mono Potassium phosphate (KH2PO4) contains 22.8% phosphorous (P) and 28.7% potassium (K) It is used in planted aquariums and for hydroponic fertilisers Both phosphorous and potassium are macro nutrients.
It can be added directly to a planted aquarium but as phosphates are normally required in very small quantities it is easier to mix it with water (preferably RO or DI) to make a stock solution. It can also be blended with other nutrients to make a bespoke fertilizer.
If using the EI dosing system typical maximum weekly uptake figures might be:-
Phosphorous (P) 1ppm. Potassium (K) 30ppm

Aquarium Dry Dosing

Adding mono potassium phosphate at the rate of 0.0015grms per ltr to a tank will increase the phosphorous (P) level by 0.34ppm and the potassium (K) level by 0.43ppm.
Added 3 times per week levels will increase by:-
Phosphorous (P) 1 ppm
Potassium (K) 1.3 ppm

Aquarium Stock Solution

Adding 15g of mono potassium phosphate to 1 ltr of water will give a stock solution with the following analysis:-
0.77% P2O5 (0.34%P, 1.03% PO4)
0.51% K2O (0.42% K)
Added to the tank at the rate of 1ml / 10 ltr 3 x week will add 1ppm P and 1.3 ppm K.
You can shop online for mono potassium phosphate here

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