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I have seen automatic dosing system at aquarium automation. It is quite cheap, but can exactly dose required amount of fertilizer. There is all needed information: schematics, misrocontroller software and manual how to use it.
Peristaltic pump is far more acurate compared wiht ordinary pump, it is designed for low amounts of fluid. Thats why i chose peristaltic pump. The most cheaper dosing pump can dose only 25ml of fertilizer per minute. There is no other type of pump, which flow rate is so small.