DOS Dual Reservoir DDR - Neptune Systems

DŌS Dual Reservoir DDR - Neptune Systems
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DOS Dual Reservoir DDR - Neptune Systems

82% Recommend this to a friend (9 of 11)

SKU: 209104
In Stock: 99
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Quick Overview

An elegant and highly refined solution to two-part/liquid storage, the DOS Dual Reservoir's advanced features are Apex Ready!

Full Details

An elegant and highly refined solution to two-part/liquid storage, the DOS Dual Reservoir's advanced features are Apex Ready!



  • Large Storage Capacity - Each vessel holds up to 2 liters of fluid for a total storage volume of 4 liters
  • Connects directly to your DOS dosing system
  • Engineered with a low center of gravity to help avoid tips and spills
  • Optical sensors provide real time fluid levels to the Apex Fusion dashboard
  • Easily removable lids to make refills a breeze
  • Built using cast acrylic
  • Push-fit tubing connections



  • Dimensions (approx) - 10.5" x 8.5" x 5.5"
  • Capacity - 2000ml per side (0.52 gallons)
  • Apex, Apex Lite, or Apex Jr. and DOS dosing system required to operate level sensors


What's in the Box?

  • DDR with sensors and cable
  • 4 meters of tubing
  • Getting Started Guide


11 Items

  • Awesome Apex integration, but some design flaws By Randall on 8/10/2017

    These are decent quality reservoirs, they look good, and they integrate well with the DOS dosers and Apex controller to provide some nifty features and a graphical representation on the Apex dashboard.

    So far, I've not had any build quality issues with this unit, although an identical optical sensor on another piece of Apex equipment has failed on me after only a couple of months, so I won't be surprised if these also go bad prematurely (as others have experienced).

    Second, I think using RODI-style connectors on this unit was a mistake. They may be waterproof, but tiny amounts of air can get in giving you bubbles in the line. Also, siliconing these connectors to prevent air leaks is not as straightforward as it is with standard barbed connections.

    Also - Why is there no disconnect for the optical sensor wire at the reservoir? No way to clean the unit without first disconnecting the cable at the DOS pump and then tediously threading it out of your cable runs. And then do the reverse after cleaning. Bad design.
  • OK for a while By Steven on 6/2/2017

    I haven't even had it six months and I've had to send it in twice for faulty sensors. It is nice to look at though, especially on an open setup. I do wish they would put a plug to unhook the wires at the reservoir rather than undoing your cord from the DOS when its time to clean it.
  • A bit spendy but nice to have! By rlauer65 on 1/3/2017

    So far so good. Plug and play as always with my Neptune DOS and the notifications when additives get down to a level you specify being based on usage with mechanical as a backup is reassuring. Light years ahead of my DIY containers with float switches and thrilled to have the added visibility this gives you through the Fusion dashboard with a quick glance.
  • Not Neptune's best By Clint on 10/13/2016

    I have two of these and love the idea of them but in reality have been disappointing. I have had to send one of them in repair twice! I would not buy again. On a positive note they are very stable (will not turn over) and don't take up much space.
  • Careful what you put in it By Art on 5/23/2016

    If you are a vodka doser, this isn't for you. The vodka (and other additives that contain vodka) will crack the acrylic. Other than that, its a great, but pricey product to pair with the DOS.
  • Quality Build By Mike on 4/4/2016

    This thing is super nice and a great compliment to the DOS... It's great for me since my reservoir is out of sight I am able to monitor the levels inside the container through fusion.
  • Very small By Sgt Harold on 3/30/2016

    It's works very well but a heavy stock tank of corals will need a bigger holder or buy two
  • I like it. By shornik on 3/27/2016

    I wasn't sure if this was worth it but I'm happy with the purchase. Yes its expensive for a dosing container but coupled with the Neptune/Apex functionality I think its worth it.
  • Expensive but no comparison By BTibb on 3/6/2016

    It is solidly built and beautiful for something most may never see, but for a gear head it is art outside the tank. Features make it unique, yet some will feel they are not needed, and that is true. For those who want the best or all the bells and whistles, add this to your collection.
  • Perfect By Simiakos on 1/14/2016

    Well constructed, easy to use and setup. Exactly what I have grown to expect from Neptune.
  • Great Product By Ron on 11/17/2015

    Set up is easy and the built in sensors display the volume of dosing liquid on your Apex dashboard. This will let you know when it is time to refill. The DOS Reservoir plugs directly into the DOS pumps so it uses no extra aqua bus inputs. The DOS Reservoir is attractive and sits on the floor next to my tank. Automation at it's finest.


Ask a question

Product Questions

Can this be used without Dos? Plugged right into a aquabus
Question by: Robert Escher on Apr 12, 2016 7:36:00 PM
Great question!
The DDR requires a 6 pin connector which currently is only on the DOS itself and not on the 1Link module or other modules. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 13, 2016 3:31:00 PM
Does this connect with 2- BOB or 1-Aquabus cable?
Question by: Del on May 22, 2015 1:30:00 PM
Great Question,
This unit will connect directly to one of the accessory ports on the DOS. This leaves one extra accessory port for future monitors and the Aquabus cables free for daisy chaining.

Answer by: Connor (Admin) on May 22, 2015 3:10:00 PM