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IceCap Auto Top Off ATO


Item #: CV28606

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Replenish Evaporated Water... with Confidence!

The IceCap ATO is a reliable dual optical sensor Auto Top Off management system that monitors and automates refilling evaporated water. Includes everything needed to install and operate.

Safely Keep Water & Salinity Levels Stable
An Auto Top Off (ATO) system is notably one of the most important pieces of equipment for a saltwater aquarium and simply a must have for any reef keeper. The IceCap ATO monitors and replenishes evaporated water eliminating the daily task of adding water manually just to keep your aquariums water stable.

The IceCap ATO is a well thought out automated system with a fail-safe design that uses two (2) optical sensors to monitor the fluid level of your aquarium or sump. The second optical sensor provides real-time protection against failure of the first sensor. Best of all, it is very easy to install and contains no moving parts that can fail.

The IceCap ATO also alerts you when your top off reservoir gets dangerously low to prevent the water pump from running dry. A bright LED indicator will allow you to visually see the status of your IceCap ATO as well as any possible issues.

Plug and Play
You simply move the magnet optical sensor base to the desired water level within your sump or aquarium. It’s that easy!

Mounts to Most Clear, Tinted or Painted Surfaces - Max wall thickness: 1/2 inch (12.7mm)

Everything Included!
Everything provided for installation and operation.

  • ATO Controller
  • 2x Optical Sensors
  • Power Adapter
  • DC Brushless Pump
  • 6.5` of Water Tubing
  • Tubing Holder
  • Will work in complete darkness!
  • Easy to install magnet mount sensor base
  • Dual optical sensor design for added safety
  • No moving parts to fail
  • Integrated fail-safe protection
  • Compact design
  • Manual top off function
  • Plug and play
  • Detachable components
  • Equipped with DC feed pump
  • Brushless DC Feed Pump
  • Max Head: 6ft
  • Max. Flow rate: 74GPH
  • Power: 4.5W@DC 12V
  • Pump cord length: 5.5ft
  • Power cord length: 5.5ft
  • Pump tubing size: Inner diameter: 6.5mm, outside diameter: 8mm Length: 6.5ft
    Note: It is possible to change to the other PUMP or solenoid valve directly(< 10W@12VDC output)
Warranty 12 Months Limited Manufacturer`s Warranty

Manufacturer information

Ice Cap Aquarium Supplies
IceCap has been introducing innovative lighting products into the aquarium hobby for more than two decades. The company is committed to producing benchmark quality products and has set the standard for efficiency and reliability. IceCap is committed to nurturing and supporting an increasingly self-sustaining hobby of coral reef enthusiasts. IceCap started the R.E.E.F. Foundation to encourage and facilitate recycling, education and a more conscientious use of both living and material resources. We carry a variety of IceCap aquarium lighting supplies including bulbs, fixtures, retrofit kits and accessories.

4 Stars


Reviewed on
December 28, 2020

No, I would not recommend this.

Inop after only 1 year

Pros: none

Cons: dies after 1 year of use

after only 1 year of use in a freshwater tank it no longer works. it just died on me last night. don't bother there are better ATO pumps out there with way better customer service. Get a Tunze instead!

Was this review helpful? 0 0


Reviewed on
October 08, 2020

No, I would not recommend this.


Worked for a month, Icecap wouldn't help and refused a refund. Use another brand.

Was this review helpful? 0 1


Reviewed on
May 15, 2019

No, I would not recommend this.

Works like a charm

Pros: Easy to install, quiet, dual eyes a great safeguard

Cons: None

Have had this in use for 3 weeks and works great. Very easy to install. Pump is super quiet and plenty strong. The dual eye safeguards against over filling and the warning alarm is an excellent safeguard. This is a great ATO and the price makes it even better!!

Was this review helpful? 2 0


Reviewed on
April 11, 2019

Yes, I would recommend this.

Icecap ato

Pros: Stability and small fit anyway

Cons: What cons

Awesome easy setup love icecap products

Was this review helpful? 3 0


Reviewed on
March 03, 2019

No, I would not recommend this.


Pros: None

Cons: Cheap plastic construction, tubing kinked (instructions say dont kink the tubing) sensors not operating as they should.

For what you pay should work as advertised. Should not have to make modifications or build something to make it work. Tech support no help. These other reviews must be as amazon does (pay for reviews). If it wasn't for the safety sensor my ato reservoir would be empty. And since I've used it can't return.

Was this review helpful? 0 4


Reviewed on
January 06, 2019

Yes, I would recommend this.

broken on arrival

Pros: super quite and efficient

Cons: poor customer service imho

After receiving my purchase I discovered many had the same issue as I did. the pump was not working. After taking it apart I found the magnet on the impeller was broken. 6 or 7 emails later a new pump was on the way. Has worked fine ever since. side note- the siphon breaker will leak water while the pump is on.

Was this review helpful? 0 0


Reviewed on
October 15, 2017

Yes, I would recommend this.


Pros: Compact. Quiet. Fail Safe technology.

Cons: Not a one.

Compact, easy to install. Sensors are remarkably quick to respond to falling and rising water levels. Pump is quiet. "Fail-safe" sensor technology is a home run!

Was this review helpful? 6 0


Reviewed on
October 07, 2017

No, I would not recommend this.

IceCap ATO

Pros: None, never worked

Cons: Junk

Do not buy! It was broke from manufacturer. The impeller magnet was cracked and would not work. If you look it up on the manufacturer’s website Coralvue.com they have a lot of complaints about it!

Was this review helpful? 0 0


Reviewed on
July 25, 2017

Yes, I would recommend this.

good, affordable ATO

Pros: easy to install, small size, and reliable

Cons: tube holder does not hold tube tightly. so better make tube long enough so that it does not escape from sump. pump didn't work at the beginning. I disassembled it to take the impellar out and reassembled. Then it worked.

good functionality at affordable price. alarms when water level is too high. also alarms when reservoir is going to be empty.
So far it is working great and reliable.

Was this review helpful? 6 0


Reviewed on
May 08, 2017

Yes, I would recommend this.

Good ATO

Pros: Works in the dark

Cons: None

Good ATO at a good price. Pump works well.

Was this review helpful? 4 0