Mix each package in a 500ml container. Shake well.  It may take a day to completely dissolve. 

PPS-Pro system is easy to use and is the least expensive system in comparison to any other fertilizer. It is designed especially for aquascapers who want a system that is performing well, doesn’t need much testing and tweaking and also works with all lights and substrates, no water changes and large water changes. Entirely 100% planted aquariums with reasonable fish load.