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Simplicity 10 Gallon Easy-Fill ATO Reservoir

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Simplicity 10 Gallon Easy-Fill ATO Reservoir

The Simplicity Easy-Fill ATO Reservoir elevates and simplifies the water top-off routine. The patent-pending, wide-mouth lid converts to a funnel for easy refills, allowing users to spend less time on maintenance and more time enjoying their aquarium. The reservoir keeps salinity and water level consistent while shielding the water from external elements and evaporation loss. These one-of-a-kind top-off containers are available in two space-saving sizes and covered by a 3-year prorated limited warranty and unlimited lifetime, US-based support.

  • Easy to Fill
  • Compact, Space Saving Design
  • Protects Top-Off Water
  • Unbeatable Value

Simplify Maintenance

The one-of-a-kind easy-fill lid with built-in splash guard allows users to quickly fill the reservoir with less mess.

Universal Compatibility

It pairs easily with nearly every auto-top-off (ATO) on the market. The lid's large opening fits most ATO pumps and features tubing and power cord cutouts.

Reduce Algae Build-up

Opaque black sides help prevent light penetration and reduce nuisance algae growth.

Track Top-Off Usage

The clear acrylic front panel with easy-to-read graduations lets you view the volume at a glance.

Space-saving Design

The compact footprint fits easily inside most cabinets.


  • Volume: 10+ gallons (38 liters)
  • Dimensions with lid closed: 8.0 in x 16.0 in. x 22.0 in. (L x W x H)
  • Dimensions with lid opened: 8.0 in. x 20.5 in. x 25.5 in. (L x W x H)
  • Weight: 12.40 lbs
  • Color: Black with a clear front panel
  • Required clearance: 26.5 in.
  • Pouring lid width: 6.75 in.
  • Pouring lid extension length: 4.5 in. past the front of the container
  • Maximum return tubing diameter: 0.5 in.
  • Maximum power cord diameter: 1.5 in. with cable groove
  • Warranty: 3-year manufacturer prorated warranty


What's Included

  1. Simplicity 10 Gallon Easy-Fill ATO Reservoir
  2. Rubber Plug for power cord hole