I hadn't heard of that process before, makeing liquid
nutrients from compost. It is an interesting concept although without the right lab equipment I would think it would be just about imposable to tell if it was a complete
nutrient solution. That is, knowing if it has all the required elements and/or in the proper proportions. Because of all the variables I would think it would be be just about imposable to duplicate time and time again also, even with the right lab equipment. Though if you were able to isolate each element and tell their exact concentrations it would be reasonable to add the missing or lacking elements and dilute the over concentrated ones. But I cant really see it as being cost effective.