JBJ A.T.O. Water Level Controller

JBJ A.T.O. Water Level Controller
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  • JBJ A.T.O. Water Level Controller
  • JBJ Auto Top Off Quick Tips | How To Tuesday
  • JBJ A.T.O. Water Level Controller Included Parts
  • JBJ A.T.O. Water Level Controller Float Switch
  • JBJ A.T.O. Water Level Controller Parts
  • JBJ A.T.O. Water Level Controller Box
  • JBJ A.T.O. Water Level Controller Brackets
  • JBJ A.T.O. Water Level Controller Hangers

JBJ A.T.O. Water Level Controller

77% Recommend this to a friend (79 of 102)

SKU: 206100

reg. $79.99

Special Price: $71.99

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Quick Overview

Why does BRS recommend this?

One of the most popular ATO systems available. The JBJ A.T.O system is by far the most cost effective way of utilizing a safe and consistent auto top off system.  With multiple configurations, the JBJ A.T.O will fit almost anyone’s needs.  With linkable brackets adjust and secure float switches, you will need to add your pump of choice, the JBJ ATO system is a great top off unit for reefers on a budget.

  • Audible Alert

  • Adjustable timer based Safety

  • Multiple configurations

  • Visual LED signals

  • Includes float switches and brackets


Note: No pump included.  The pump will need to be able to refill the amount of evaporated water in just a couple of minutes.  BRS suggest purchasing a pump that is just slightly larger and placing a ball valve to control the overall amount of flow.  We suggest looking into the Sicce Syncra Silent line of pumps or the BRS 50 mL top off pump.


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Product Questions

Are we able to order the system with different voltage 240v - 50 Hz?
Question by: HELMUT DRESSELHAUS on Jan 26, 2016 9:13:00 PM
Great question!
We do not have voltages other than standard North American. Unfortunately our products are intended for use in the US and Canada only. Feel free to let us know if you have any further questions.
Answer by: Connor (Admin) on Feb 3, 2016 5:07:00 PM
What is the factory preset internal timer set for? Thanks!
Question by: Timothy Gladders on Mar 23, 2016 7:22:00 AM
Great question!
The max on time for the unit will be 14 minutes. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 23, 2016 10:48:00 AM
My unit pumps as soon as power is applied. Like after a power outage. Is there a way to stop this. It pumps for a good 5 seconds until it seems to find itself and the sensors.

Question by: Wade on Mar 1, 2016 7:59:00 PM
Great question!
We are not aware of this feature being able to be turned off. You may want to contact the manufacturer to see if there is any adjustments. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 2, 2016 5:23:00 PM
what's the recommended pump for the ATO JBJ? thanks!
Question by: werner on Oct 29, 2013 6:21:00 AM
Hey Werner,
Really just about anything will work in terms of the ATO itself, its more about how far and fast you need to pump water. The most common pump is the aqualifter pump which pumps slowly and only goes a couple of feet. Otherwise if you need to pump larger distances you could use something like the 50ml top off doser.


Answer by: Bulk Reef Supply on Oct 29, 2013 6:21:00 AM
Why do i still get drips of water out of my discharge hose non stop even after the vaccum pump has shut off the.
The vacuum pump is on the bracket at the top of the tank at lease 3 ft. higher then my R/O holding tank(no pump in here for the A.T.O.
Question by: jerry on Jan 17, 2014 1:24:00 AM
Hi Jerry,
Is the water in your storage container higher off the floor then the water in your sump? If so that would create a siphon when the pump turns on and water would continue to pass to the tank after it turns off (regardless of where pump itself is located).
Answer by: Bulk Reef Supply on Jan 17, 2014 1:24:00 AM
What kind of pump is recommended for this system thanks
Question by: Dan on Aug 29, 2014 3:28:00 PM
Hi Dan,

Any low flow pump will work with this ATO. I ave personally used our 50ml/min dosing pump but find that it had trouble keeping up with large systems. I moved to the Auqa Gadget HydroFill ATO Pump due to the fact that it can be run dry without any problems, its self priming and it won't back siphon.

Another great option would be a small submersible pump like the eheim 300 or sicce micra and micraplus

Keep in mind these pumps are rated for low head heights so if you are running the ATO hose from the ground to the top of your tank you will need to go a little bigger.

I hope this helps!
Have a great day :)
Answer by: Bulk Reef Supply on Aug 29, 2014 3:28:00 PM

Full Details

JBJ ATO Self-Leveling Controller Features:

Float Sensors

The A.T.O. is equipped with (2) float sensors that activate within seconds when your water level drops and automatically refills your sump or tank until it reaches your desired set point. Each float sensor has been designed with an exterior guard preventing snails & hermit crabs from attaching to the sensors.

Electronic Controller Module

Our state-of-the-art electronic controller allows for (2) modes of operation with a total of (3) different set up scenarios, allowing you more choices for installation for your unique set up. Our compact controller also incorporates a visible L.E.D. panel and an Audible Signal alerts when in operation mode.

Linkable Brackets

The kit includes commercial grade "Linkable Brackets" that can easily be adjusted to meet your height requirements, and securely positions your float sensors. No suction cups to lead to disastrous water spillage.

Pump Safety Protection

The A.T.O. automatically stops power to your return pump in your reservoir, in the event that your reservoir is low on water. This safety feature prevents pumps from running dry and failing. (Mode A- Example 1)



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  • No go By Just_Tim on 5/21/2016

    Ive bought 3 of these. None of them lasted longer than 6 months. 1 blew it's board in 60 days, the other two stopped recognizing the float switches. Jbj did send me a new head unit but after 3 failed controllers I have completely lost faith in the products this company pushes.
  • short lived By Chris on 4/29/2016

    these just don't last.
  • Positive Review By Jason on 2/16/2016

    I am running the JBJ ATO on my 27 gallon cube with the eshopps sump. I highly recommend watching the videos and setting the ATO with Sensor A triggering the pump and flipping Sensor B around to shut the pump off if the water volume gets to high in the sump.
  • Money Well Spent By Chris on 1/4/2016

    Easy setup, straightforward indicators, and well priced. I haven't had any issues at all in months of use, and little to no build-up on the floats. I do still clean them with my sump maintenance, and splash some water on them to stave off salt creep now and again. I do like having the second float as an off switch as recommend by the BRS video. Will buy again if I need another.
  • Same story different person By josh on 12/22/2015

    I recently had this product working well for about a month or two. Switched it to a different tank and now the red light goes on for instilling water and does not go off, switched sensors, power on and off, no kinks in sensors, it just does not work. Very disappointing. Had a great start
  • Nice By Phand on 12/19/2015

    I purchased this with a nice pump very reliable and cost effective
  • Disappointed By Sad Panda on 12/1/2015

    Biggest thing I found was that if I have power outages even for a minute or two when the power comes back on the ATO turns on the pump for about 10 seconds "no matter what the water level is". If you have several power stops and starts like when they are trying to get the power on after a storm you could end up with a flood.
  • doesn't work properly By azreef on 3/13/2015

    Came out of box looking good, but after setting up it does not want to turn on the pump when needed. Just lights up red indicating water level low, but the relay does not turn on unit. Disappointing!
  • Works Great! By Reefer on 2/4/2015

    I've had this unit up and running for 5 months now with no issues what so ever. Very easy to set up and install. I clean the float off that sits in my sump once a month to make sure no debris is caught in it and can cause it to malfunction. I like the different install options you can do with this unit. I have my floats installed so one is in my sump and tells it when the water level is low, and the other is in my reserve pump so it kills power to my pump when the water level gets too low so it won't burn out my pump.
  • Automated is better By David on 1/17/2015

    I use to use a on/off timer to add RO water throughout the day, the JBJ is SO much easier.
  • Great Value By DanoSiena on 1/5/2015

    Took me a little while to get it up and running, but my tank has been rock solid since. Great buy so far!
  • good at first but didn't last By Keep with the program dori on 12/17/2014

    Worked fine for about a year of course is that in the box for about six months before I plugged it in. After which the relay started to not always switch on the pump. It would light up appropriately but not turn on the switch untell you power cycled the JBJ. Took me a while to figure this out. I spoke to JBJ at reef conferences And they seemed eager to help me.of course once I contacted them then they never responded to any correspondence and were of no help. So I programmed my controller to turn the thing off and on three times an hour so hopefully one of those times the relay would work appropriately. Now in the market for a new auto top off

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