Aquarium Fertiliser Mono Potassium Phosphate Pure 99.9% DIY KH2PO4 E340 UK 90g
20g KH2PO4+ 500ml water, 1ml solution per 100 l of tank water yields a concentration of 0.28 P and 0.1 K ppm. 10g KH2PO4+ 500ml water, 1ml solution per 100 l of tank water yields a concentration of 0.14 P and 0.04 K ppm.