DIY Automatic Tank or Sump Top Off

By Stan & Debbie Hauter, About.com Guides

Here is a reliable automatic top off system which is simple to install with only a couple of tools. This Do It Yourself automatic top off system can take less than an hour and can cost less than $50. This system feeds filtered water to the tank/sump in small amounts as it is needed, reducing water parameter swings.

This DIY Automatic Top Off System consists of a saddle valve to tap into an existing cold water pipe (usually found under the sink in the kitchen or bathroom), a length of 1/4" plastic (NOT copper) tubing from the saddle valve down through the floor, under the house, then up through the floor under or behind the aquarium. A float valve is installed either in the tank or in the sump. A tap water filter is installed in the water line at either the aquarium or saddle valve end.

Tools needed:

• Portable Drill
• 5/16" Long Shaft Drill Bit
• 7/16" Drill Bit
• Scissors
• Adjustable Wrench  (or Box End, Open End Wrenches)
• Phillips Screw Driver

Supplies Needed:

• Caulking
• Wire Staples
• Stiff Wire
• Tape

Parts needed:

• Saddle Valve
• Tap Water filter
• Float Valve
• Electric Float Switch
• Solenoid Valve
• 1/4' Flexible Hose

The Auto Top Off graphic above shows the basic set up of the Auto Top Off System with a second Electric Float Switch and solenoid installed as a fail safe to prevent sump overflow.