/challenges-projects/design-challenges/vertical-farming/b/blog/posts/automated-green-house-blog-20-1---toying-with-chemical-analysis---essential-nutrientsHey Guy’s sorry for the delay, This is some basic info/background research to make an Open Source chemical analyser for the nutrient fluid in aquaponics/hydroponics systems. We really need more information about the growing fluid at our disposa...en-USTelligent Community 12