The cost of a missed aquarium service call is specific. A cloudy display sits through the weekend because the shop never heard the manager.
The caller had tank gallons, the percent to change, and which system. A voicemail that says "call me back" drops all of it. They do not reconstruct the note for the company that failed to answer.
Holiday weeks, when lobby tanks and restaurant displays cannot go down makes the miss louder, because the next company that picks up takes the window. North writes tank gallons, the percent to change, and which system while the caller is still on the line, then a local company calls back with a real time.
The Water change gallons is the planning total, gallons to pull. It does not bill anyone. It keeps the callback from starting at zero.
