Dilution is taking a liquid that has a certain concentration and adding more liquid to make it weaker. A example would be that you have a 0.2 liter solution that has 200 PPM of fulvic acid and you want to add enough water to turn it into a 100 PPM solution. So what should you do? This is a simple example, and you would just add another 0.2 liter of water. but what about something more complicate, like 0.2 liter of 200 PPM and bringing it down to 30 PPM?