In the fish food, water, water, water transfer in a system in which the timer or set of instructions, data, ordered the system to work ahead can check or edit it in the system.
In feeding fish, water filtration, water purification, the water in the system. The scheduling information or instructions that dictates that the system can run pre-check or edit it could do in the system.
In feeding, filtering water, taking water, filling water in the system. The scheduling algorithm, or collect information command system works in advance can verify or edit it can do in the system.