Level one — restore flow. What it is: plunging, cabling, or removing a trap to clear the obstruction and get water moving again. How long it takes: minutes to an hour. What it costs: the least of the three. How long it lasts: entirely dependent on what caused the blockage. If it was an object — a toy, a cloth, a bottle cap, something dropped — it lasts forever, because the cause left with it. If it was accumulation, a cable bores a hole through the mass and leaves most of it coating the pipe wall, which closes back over in weeks or months. When it's the right answer: a one-off obstruction, and any situation where the property needs to be usable right now.