Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean a salt cell [title] Turn the power off. [step] Before you start messing with the cell, the power needs to be off for safety's sake. Don't try to unscrew the unit while it is still on.

Ending1: Most filtration systems have an easy access switch to turn the power off. [substeps] On some units, simply press the button next to " filter " on the control panel. Ending2: Doing so could lead to dropping an excellent amount of salt in the tank and, more importantly, breaking the unit. [title] Spray the tank before you pour it out. Ending3: Let the unit sit for at least 10 minutes. [substeps] If there are any thick plastic pieces on the bottom when you unscrew it, use a sharp knife to separate them from the rest of the pieces. Ending4: If you would like to simply unfasten the power device, removing the unit is the most straightforward option, but often it is very risky. [substeps] If you have a power adapter, open the socket and take the drive out of the drive, then unscrew the drive cable and remove the drive cable.

Answer format: ending1/ending2/ending3/ending4