If your planning a backyard pond, locate it where it is unlikely to attract unattended children. Check local safety ordinances to determine if a fence is required for the specific depth and size of your pond. Check local building ordinances for depth and safety restrictions and permits. Equip outdoor outlets with a ground-fault circuit interrupter. Unplug the pump before cleaning the filter.
To increase accuracy, some woodworkers avoid using the zero end of a rule or tape and use the 1-in. mark instead. You can also use other starting points, such as 2 in. or 3 in. However, when using this technique, you must remember to subtract that number from the actual reading further down the rule.