Skip to content
Simplicity 5 Gallon Easy-Fill ATO Reservoir main image angled view

Simplicity 5 Gallon Easy-Fill ATO Reservoir

by Simplicity
$139.95

Notify me when back in stock

Why Buy From Us?

🚛 Free Shipping On All Orders

Don't worry about shipping costs. We prioritize customer satisfaction from start to finish.

☑️ 30-Day No Stress Returns

Why stress when you're covered by our 30-Day No Stress Returns Policy!

💲 Price Beat Guarantee

Found a product cheaper elsewhere online? Let us know! We'll match or beat it.

Call us to get a great price! (800)518-0141

Effortless Aquarium Top-Offs with Simplicity 5 Gallon Easy-Fill ATO Reservoir

Simplify Your Aquarium Maintenance with the Simplicity 5 Gallon Easy-Fill ATO Reservoir

The Simplicity 5 Gallon Easy-Fill ATO Reservoir revolutionizes your aquarium's water top-off routine. Its innovative design and user-friendly features make maintaining consistent water levels and salinity a breeze, allowing you more time to enjoy your thriving aquatic ecosystem.

Simplicity 5 Gallon Easy-Fill ATO Reservoir front view

Key Features & Benefits of the Simplicity 5-Gallon Easy-Fill ATO Reservoir:

  • Effortless Refills: The patent-pending, wide-mouth lid transforms into a funnel, making refills quick, easy, and mess-free.
  • Universal Compatibility: Works seamlessly with virtually any auto top-off (ATO) system on the market, thanks to its large lid opening and tubing/power cord cutouts.
  • Reduced Algae Growth: Opaque black sides minimize light penetration, preventing unsightly algae growth within the reservoir.
  • Easy Monitoring: The clear acrylic front panel with convenient graduations allows you to track water levels at a glance.
  • Space-Saving Design: The compact footprint fits easily inside most aquarium cabinets, maximizing your available storage space.

Simplicity 5 Gallon Easy-Fill ATO Reservoir angled view lid open

Specifications:

  • Volume: 5+ gallons (19 liters)
  • Dimensions (Lid Closed): 6.0 in. x 16.0 in. x 15.25 in. (L x W x H)
  • Dimensions (Lid Open): 6.0 in. x 20.5 in. x 19.0 in. (L x W x H)
  • Weight: 8.30 lbs
  • Color: Black with a clear front panel
  • Required Clearance: 20.0 in.
  • Pouring Lid Width: 4.75 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

Simplicity 5 Gallon Easy-Fill ATO Reservoir angled view pouring lid

What's Included:

  • Simplicity 5 Gallon Easy-Fill ATO Reservoir
  • Rubber Plug for power cord hole
Simplicity 5 Gallon Easy-Fill ATO Reservoir setup guide

Elevate your aquarium maintenance routine with the Simplicity 5 Gallon Easy-Fill ATO Reservoir – the smart and convenient solution for consistent water levels and a thriving aquatic ecosystem.

Effortless Aquarium Top-Offs with Simplicity 5 Gallon Easy-Fill ATO Reservoir

Simplify Your Aquarium Maintenance with the Simplicity 5 Gallon Easy-Fill ATO Reservoir

The Simplicity 5 Gallon Easy-Fill ATO Reservoir revolutionizes your aquarium's water top-off routine. Its innovative design and user-friendly features make maintaining consistent water levels and salinity a breeze, allowing you more time to enjoy your thriving aquatic ecosystem.

Simplicity 5 Gallon Easy-Fill ATO Reservoir front view

Key Features & Benefits of the Simplicity 5-Gallon Easy-Fill ATO Reservoir:

  • Effortless Refills: The patent-pending, wide-mouth lid transforms into a funnel, making refills quick, easy, and mess-free.
  • Universal Compatibility: Works seamlessly with virtually any auto top-off (ATO) system on the market, thanks to its large lid opening and tubing/power cord cutouts.
  • Reduced Algae Growth: Opaque black sides minimize light penetration, preventing unsightly algae growth within the reservoir.
  • Easy Monitoring: The clear acrylic front panel with convenient graduations allows you to track water levels at a glance.
  • Space-Saving Design: The compact footprint fits easily inside most aquarium cabinets, maximizing your available storage space.

Simplicity 5 Gallon Easy-Fill ATO Reservoir angled view lid open

Specifications:

  • Volume: 5+ gallons (19 liters)
  • Dimensions (Lid Closed): 6.0 in. x 16.0 in. x 15.25 in. (L x W x H)
  • Dimensions (Lid Open): 6.0 in. x 20.5 in. x 19.0 in. (L x W x H)
  • Weight: 8.30 lbs
  • Color: Black with a clear front panel
  • Required Clearance: 20.0 in.
  • Pouring Lid Width: 4.75 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

Simplicity 5 Gallon Easy-Fill ATO Reservoir angled view pouring lid

What's Included:

  • Simplicity 5 Gallon Easy-Fill ATO Reservoir
  • Rubber Plug for power cord hole
Simplicity 5 Gallon Easy-Fill ATO Reservoir setup guide

Elevate your aquarium maintenance routine with the Simplicity 5 Gallon Easy-Fill ATO Reservoir – the smart and convenient solution for consistent water levels and a thriving aquatic ecosystem.

Here's what you can expect with our Angel Aquariums free shipping policy:

  • Effortless Ordering: Place your order and leave the delivery to us!

  • Fast Processing: We typically process orders within 1-2 business days.

  • Standard Shipping Speed: Expect your item(s) to arrive within 3-7 business days after processing.

  • Convenient Tracking: We'll send you a shipment notification with tracking information so you can follow your aquarium's journey to your doorstep.

  • Order Confirmation: Double-check everything! We'll send you a confirmation email after you place your order. Please review it for accuracy and let us know if you have any questions.

Shop with Confidence - Free Returns on Everything!

We understand that shopping online can sometimes mean uncertainty about sizing or fit. That's why we offer free returns on every single purchase, taking the worry out of your shopping experience. If anything isn't perfect, return it for free – no questions asked!

Here's why choosing us with our free return policy is the best:

  • Reduced Risk – Shop freely! Knowing you can return anything for free means you can shop worry free.
  • Peace of Mind – Stress-Free Shopping! Focus on finding the perfect items, we'll handle any returns if needed, ensuring a smooth shopping experience.
  • Shop Smarter, Not Harder! Our free return policy allows you to shop more efficiently, saving you time and money on unnecessary exchanges.

At Angel Aquariums our customers are always first

Here's what sets us apart:

  • Hassle-Free Returns: Enjoy a 30-day easy return policy for peace of mind.
  • Price Beat Guarantee: Found a product cheaper elsewhere online? Let us know! We'll match or beat it.

  • Free Shipping on all orders: We bring the convenience to you, for free (within the contiguous US)!

What is an ATO system?

An ATO (Automatic Top Off) system is a device that automatically replenishes evaporated water in an aquarium, maintaining a consistent water level. It typically consists of a water reservoir, a water level sensor, a pump, and a controller.

Why use an ATO system?

  • Maintains water level: Prevents salinity fluctuations caused by evaporation.
  • Protects equipment: Prevents dry running of pumps and other equipment.
  • Saves time: Eliminates the need for manual water top-offs.
  • Improves water quality: Reduces the frequency of large water changes.

How does an ATO system work?

  • Water level sensing: The sensor monitors the aquarium's water level.
  • Pump activation: When the water level drops below a preset point, the pump is activated.
  • Water replenishment: The pump transfers water from the reservoir to the aquarium until the desired level is reached.

How do i know which ATO system i need?

  • Tank size: Select a system with a suitable reservoir capacity and pump flow rate.
  • Water quality: Consider the type of water you'll use and the system's compatibility.
  • Features: Evaluate options like multiple sensors, alarms, and adjustable settings.
  • Budget: Determine your spending limit for the ATO system.

What does maintenance look like?

  • Reservoir cleaning: Regularly clean the reservoir to prevent algae growth.
  • Sensor calibration: Check sensor accuracy and calibrate if needed.
  • Pump inspection: Inspect the pump for wear and tear.
  • Water quality: Maintain good water quality in the reservoir.

What is an ATO reservoir tank? and what do i need to know?

An ATO reservoir tank is a container used to store water for an automatic top-off system. It typically has a larger capacity than the daily evaporation rate of the aquarium to minimize refilling frequency.

Choosing an ATO reservoir tank

  • Size: Select a reservoir with sufficient capacity for your aquarium's evaporation rate.
  • Material: Consider using a clear or translucent material to monitor water level.
  • Lid: A lid helps prevent dust and debris from entering the water.
  • Placement: Choose a location that is easily accessible and allows for proper water drainage.

ATO reservoir tank maintenance

  • Cleaning: Regularly clean the reservoir to prevent algae growth and buildup.
  • Water quality: Maintain good water quality in the reservoir by using deionized or RO water.
  • Lid inspection: Ensure the lid is securely closed to prevent contamination.