The Mixologist - Automated nutrient mixing for hydroponics.

I use a total of 9 different solutions when I'm mixing up my hydroponic nutrients, and when there's four or five different tanks which need changing it becomes a very time consuming process. I decided to see if I could add some automation to the process and try and make a system where I could push a button to get the correct mix of nutrients by using a bunch of little dosing pumps for dispensing nutrients in the right quantities. I've mentioned this project a couple of times in the past but have never given a formal introduction, or an explanation of exactly what I'm trying to achieve, so I thought it was about time.