A sump pump can be a real live saver. Like an automobile airbag, you hope you will not need it, but if you do, it can save your life. A basement sump pump can be either the manual or the automatic type. There are battery operated backup pumps available as well.
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If you decide to install or work on your sump pump yourself, do be careful. The reliable operation of the equipment is critically important when needed. The combination of water and electricity is of course potentially dangerous. For greatest safety, you may wish to call on a qualified and licensed plumbing contractor to inspect your system. If a new installation is required, your licensed plumber will be able to set you up with a system that will keep your basement dry and safe for many years to come.