This is our recommended auto top off system and has many features that make it well worth the price.

• Relies on an electronic eye (no moving parts) to maintain water level instead of a float switch. Float switches are notorious for getting stuck on or off due to salt creep or other issues.
• Has a Secondary Float switch just incase the eye fails somehow.
• Addible alarm if the secondary switch is activated.
• Multiple mounting brackets that will work on almost ant type of tank or sump. The brackets do not rely suction cups that always fail.
• Adds slightly more water than is needed. This stops the unit from continuously turning off and on due to small waves.
• Includes a metering pump that is quiet. The pump is also very affordable when it needs to be replaced.

After trying many different types of water level switches and auto top off solutions this is by far our favorite. Spending a few bucks now can save you from a compete tank disaster, the expense of replacing your floors and an angry spouse : )