X water (for evaporation refilling) will be refilled with just the amount of evaporation, so the amount of use may vary depending on the surrounding environment. As an estimate, 5.1 fl oz (150 ml) is equivalent to 6 months to 1 year supply. X Water is artificial water that contains the abundant minerals needed to maintain the ecosystem of Scarlet Shrimp with organics, bacteria, and trace algae. Organic and minerals are nutritional content of algae, which uses photosynthesis in a slight amount of light to supply oxygen into the water. Scarlet Shrimp food algae and the excrete is broken down to organic matter by bacteria and then rererejuvenate algae. XX water is the X water of "salted". Use it when you want to transfer scarlet shrimp from existing HOLOHOLO to new series lahaina containers or transfer from HOLOHOLO to another container. When refilling normal evaporation, always use X water.