CANNA COCO nutrient consists of two parts, an A part and a B part. We separate these parts for a reason. The amounts of Calcium and Phosphate that have to be present for the nutrient to do its job properly are quite high. When you put such highly concentrated elements in one bottle they will conflict with each other sometimes resulting in a slimy residue. When you separate these two elements from each other, then mix both of them with the water in your nutrient reservoir later on,there is no problem. That's why you should first add the A component and then the B component!