The call that comes at the worst hour
A grease trap overflows in the middle of the dinner rush. A floor drain backs up an hour before opening. A septic system starts coming back up into the house on a holiday weekend. None of these wait for the office to open, and none of them get better by waiting.
A full trap pushes grease into the line, and a blocked line sends everything behind it back up to the lowest drain. The longer it sits, the more the smell spreads and the longer the kitchen stays closed.
