The gel crystal are used to hydrate the roaches in the event that fruits or vegetables are not available or in short supply. They are especialy good to have when you are planning a trip and need a longer term way to hydrate your colonies or pets. They can be beneficial for adding humidity to an area that you don't nessesarily want to be wet. The quantity that I sell is enough to make aproximently 1 quart.
Add the dry crystals to water and drain off any exess water after about 3 hours or more. These are the large crystals, as the finer ones tend to be snotty. I use a styrofoam bowl because non-climbing roaches can get into the crystal and when it is in need of changing the whole bowl and all can be discarded.