Best Aquarium Auto Top Off Water Filler

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As clear and transparent as water is, it has a few certain characteristics that can give us a few troubles when taking care of the aquarium. Water evaporates, hence the need to have the best aquarium auto top off water filler.

Water is a very basic part of our lives. Without it, how can we fill the fish tank, in order to ease our burden, the Auto Top Off System for Aquarium has been invented.

Having to check and refill the water in your tank every day can be quite a chore. So, the good news is there is a device that can automatically do that for you. It’s the auto top off system.

The best auto top off system can work for many aquarium be it reef tank, saltwater aquarium, freshwater aquarium, and many other aquarium types.

Just about every aquarium and reef tank owner know that leveling the tank water is simply one of those things you have to do. It’s the nature of water that they evaporate, so you have to replenish the water that you’ve lost.

Criteria For Choosing The Best Aquarium Auto Top Off Water Filler

Strength of the product: When buying your Auto top off, you should make sure you factor the strength of the product in your thought before purchase.

Durability: How durable your potential Auto top water filler is will determine just how long you will use them for.

Safety: Is the aquarium auto top off water filler safe to use with your aquarium Tank before buying, this is the question you have to get answers to before you continue with your purchase.

Review: Be sure to read what present owners and previous owners of the potential auto top you want to purchase has said about the product you want.

Top 10 Best Aquarium Auto Top Off Water Filler in 2020 (Reviews and guide)

1)Tunze USA 3155 Automatic Top Off Osmolator for Aquariums 

Tunze 3155 automatic top off osmolator for aquarium is a High-tech product from Tunze produced to ensure a reliable water level in the aquarium In 1985.

Tunze invented the automatic refill system for aquariums. Some people regarded this invention as a useless accessory.

But they forgot something very important: sensitive aquarium animals need a constant osmotic pressure within their cells.

The Osmolator (osmotic regulator) is very easy to install and provides its complete functionality in a single compact unit.

Only the Osmolator is able to provide you with the necessary security and reliability, since it is based on the vast experience that Tunze has been able to gather throughout the course of many years.

Primary sensor is a mini optical infrared sensor for extremely precise regulation. A secondary float sensor serves as an independent back up.

A ten minute timer shuts off the pump is the sensors fail. Ships complete with tubing, pump and power supply and magnetic mounts for sensors.


2)Tunze USA 3152.000 Automatic Top Off Nano Osmolator for Aquariums Under 55 Gallon

Tunze 3152 automatic top off nano osmolator for aquariums has water level controller with only one sensor for nano aquariums or small aquariums with up to 55 US gal.

It can be installed in a cabinet filter or directly on the aquarium edge.

The auto top off comes ready for installation with 11V power supply, low-voltage metering pump, 118 inch hose, magnet holder for up to 3/8″ glass thickness and a protective cover for the sensor.

Its Safety timer shuts off system after 1.8 or 3 minutes as set by user.


3)AutoAqua Smart ATO Micro Automatic Top Off System (SATO-120P)

The Smart ATO Micro is a unique Auto Top Off system that monitors and automates refilling evaporated water.
It is very easy to install and contains no moving parts that can fail.
This ATO comes integrated with QST (Quick Security Technology) which provides real-time fail safe protection against failure.
You simply move the optical sensor to adjust the desired water level within your sump.
It comes with a Controller/Sensor, Power Adapter, DC brushless pump capable of pumping to a height of ~6.5 feet and a maximum flow rate of ~74 gph and 6.5′ of water tubing with magnetic mount tubing holder.
This auto top off can work in complete darkness. It has Maximum wall thickness: 1/2 inch (12.7mm) ,Mounts to Most Clear, Tinted or Painted Surfaces.
It also Safely keeps water & salinity levels in Marine Aquariums stable and ensures that no moving parts that can fail.
The producer advises that if the alarm has been on for more than 4 minute please reset unit by unplugging and waiting 10 seconds to re plug it in.

4) JBJ Automatic Top Off Water Level Controller for Aquarium


JBJ automatic top off water level controller for aquarium is a professional grade product that automatically refills evaporated water.

The all in one A.T.O. device is the most advanced water level controller system on the market.

It is Equipped with two float sensors that activated with in seconds when your water level drops

The auto top off refills your sump or tank to reaches your set point

It also ensure that electronic controller allows for two modes of operation with a total of three different set up scenarios.


5) XP Aqua Ultimate ATO – Complete 4-Sensor Aquarium Auto-Top-Off System


XP aqua automatic auto top off system is said to be the world’s first 4-sensor ATO

It has one sensor for top-off detection

Then two sensors dual-stage overfill alarm w/ QST Programming

And One sensor for run-dry protection

The 4 sensors allow us to design a dual-stage overfill alarm that is less intrusive as well as a run-dry protection feature that prevents your sump from running dry: which is also a first.

The auto top off has Versatile installation with accessories included, efficient DC Pump with Socket switch for use with AC pumps (up to 10A)

It has Solenoid valve for use with RO/DI systems and Super precise water level control

The auto top off has Super easy installation; plug-and-play, no programming or adjustments required and works in complete darkness.

6) Aquarium Triple Sensor ATO Complete Solution Optical Sensing Auto Top Off Auto Water Filler with Anti-Overflow Sensor

Fzone ATO is a automatic smart water replenishing device for meeting the needs of using water reservoir.

As long as the sensors and tubing are installed, it can work after powering on without any settings.

The sensor uses a magnetic stand for easy installation and adjustment.

The standard 1 channel optical level sensor is used to monitor the water level to determine whether it needs to be replenished.

It has Standard 3 float level sensor is used to monitor the water reservoir for water shorage.

ATO is rich in status indicators. When The Anti-Overflow sensor or overtime, the refill pump is not inserted or the water reservoir is short of water, the ATO will have an indicator light and buzzer alarm.

It also can work in complete darkness.


7) Marine Color Aquarium ATO auto top Off System, Water Filler with 3 sensors,Pump Include


MarineColor ATO system is designed for marine and fresh aqaurium

It has 3 sensors include, 2 infrared sensor and 1 float sensor, the float sensor is backup sensor

The system is DC 12V system, it is safe and Energy Saving.

The auto top off led have different color for indicating ATO system different working status

It has a sensor cable that is 6 feet (1.8 meters) length and can pump water to 6 feet height.

Also, the sensor braket can clip both open and reinforce tank and a sound alarm to indicate when water container is empty or when the water level arrive float sensor level.


8) WuyouChy Auto Top Off Water Filler Aquarium Mini ATO System Fish Tortoise Tank Water Level Controller No Wiring Float Valve



When you are on a business trip or traveling, use this water compensator to avoid water shortage in your fish tank, aquarium tank, tortoise tank, or other tanks.

To use it, you need an ordinary 1-2L water bottle.

Screw the compensator to the bottle, then stick it to the tank. No wiring or power supply required.

When the water level drops to reveal the shorter tube, the water in the bottle automatically flows into the tank due to pressure difference.

You can cut the tube into the length according to the water level you want.

Each compensator comes with 3 replaceable slots, suitable for 4 kinds of tank thickness: 4mm, 6mm, 8mm, and 10mm.

For other thickness, you need to prepare extra gasket.

For large tank or long time leave, you can increase water supply by using multiple water compensators.
Only 35 mm in length, width and height, little space required.


9) Hydor Smart Wave Circulation Pump Controller

Smartwave helps recreate the natural currents that promote a healthy aquarium by controlling one or more pumps.

This easy to use, smartwave has 2 different movement programs, alternating and sychronized, with exchange times between 5 seconds and 6 hours.

It has 2 different feeding programs, manual or programmed. Compact smartwave is easy to conceal by positioning it inside the aquarium cabinet.

Smartwave works with most movement pumps available on the market compatable with quick on-off programs. Each channel or outlet can handle up to 100-watt.

The auto top off is Splash resistant and has built in hanger for wall or cabinet mounting.

10) XP Aqua Sumpless ATO – Complete Aquarium Auto-Top-Off System for Sumpless Aquariums



This auto top off is engineered Specifically for Aquariums without Sumps.

The combination of the sleek overflow box and the innovative dual-optical sensor ATO will help to keep your aquarium topped off and your water crystal clear.

XPAqua’s proprietary dual-optical sensor packs two precise level sensors in one incredibly small package.

In addition to keeping your water level constant, the two sensors also work in concert with the intelligent QST programming to help prevent overfilling.

Also, it comes with Intelligent Pre-Programmed Algorithm

It doubles as an Effective Surface Skimmer to rid your aquarium of undesirable oily surface skim and doubles as a media reactor for carbon, GFO or any media of your choice

It also Works in Complete Darkness.


What you need an Auto Top Off System?

Water evaporates at any temperature away from your aquarium tank.

For keeping a fish tank or an aquatic aquarium, this characteristic of water can be troublesome.

There will be less and less of water in your tank each day.

And when the water drops too low, it can cause a severe problem for your fish and aquatic plants.

In order to save fish keepers from this problem, the auto top off (ATO) system has been invented for everyone’s best convenience.

An auto top off system is a system designed to automatically detects the water level in your tank with a sensor.

Whenever the sensor senses that the water level drop below a certain point, the system will automatically replace the evaporated water so the water level in the tank can go back to the optimal level.

Without this system, you may not have to carry a bucket of water, pour into the tank and wipe down spills, it saves you the time and energy

The salinity is also kept stable with the system. The auto top off system will maintain your pump from running dry.

The auto top off system is not only useful for your everyday life maintaining your fish tank, but it is also especially useful when you are out of the house on a vacation.

You can set an automatic fish feeder all you want when you are away on your trip, but it won’t do as much for your fish if you come back to a tank all evaporated without any water left.

The auto top off system will take care of refilling the tank with water and not let the tank dry out and destroying the living environment of your fish and aquatic plants.

What is the Best Auto Top Off water filler System?

When choosing the best auto top off system for you and your tank, consider some of the followings:

What is Included in the Package?

Normally, the basic kit of a package of an auto top off system would include a self-leveling controller, one or two sensors, and mounting implements.

Sometimes the complete package will also include a pump and hoses. The pump is an accessory you need to pay attention to.

If you already have a pump with you, then you don’t need the included pump in the package.

But if you do not have one already, choosing a complete package with one included can save you a lot of time setting up the system in the beginning.

How is the Installation Process?

if you are not the most crafty person ever, opting for something easy to install and set up in your tank can help you save lots of energy and efforts.

Many systems come with magnetic mounts. They are very easy and simple to install.

What is the Size of your Tank?

Most of the time the auto top off system does not take the size of the tank into account. However, the pumps do.

So check the pumps of the system or the pumps you already have, see what their capacity are. If the pumps are too weak, it will take the tank very long to be refilled.

What is your Budget?

There are quite a few other accessories you need to buy for your fish tank so don’t let the auto top off system uses up all your budget. Choose one that you can afford comfortably.

The need to keep water at the desired level free of debris is highly essential.

This can be achieved with any of the above ten listed best aquarium auto top off water filler in the market.

You will find it conducive to go shopping for any of these products because they are the best and are highly reputable in the aquarium automatic water filler market.

We hope that this article will help you make the best decisions when you are going to shop for the best aquarium auto top off water filler.

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