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Home » Saltwater Aquarium Supplies  » Dosing Pumps & Top-Off  » Electric Powered  » Plug-In Units  »  Aqua Medic Reefdoser Dosing Pump Twin
Aqua Medic Reefdoser Dosing Pump Twin

Aqua Medic Reefdoser Dosing Pump Twin

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Aqua Medic Reefdoser Dosing Pump Twin Information

The Aqua Medic Reefdoser is one of those highly anticipated products that brings a smile to the face of every reef hobbyist that sees one. The Reefdoser can independently run up to 4 dosing pumps. The integrated controller allows for precise adjustment of the on/off cycle duration for each pump over a broad time span - anywhere from seconds per minute to hours per day. The Reefdoser can automate many tasks in your aquarium system: - regular dispensing of trace elements and fertilizers into salt and freshwater systems - controlled addition of two part calcium additives in separate intervals - accurate dosing of Kalkwasser into reef tanks - regular feedings of live phytoplankton and zooplankton

RD2 reefdoser twin with 2 dosing pumps - Dosing pump controller

The Reefdoser can independantly control up to 4 dosing pumps. The interval controller allows for adjustment of the duration of the on/off cycle for each pump over a broad time span -from seconds to days. The Reefdoser can automate many tasks in an aquarium:

  • Regular dispensing of trace elements and fertilisers in salt and fresh water aquariums
  • Controlled addition of Calcium and bicarbonate into coral reef tanks
  • Accurate dosing of Kalkwasser into coral reef tanks
  • Automatic feeding with live phyto and zoo plankton


Model Unit Dimensions Dosing Pumps Power
Length Width Depth
Twin 9" 4.5" 3.5" 2 9 watts
Triple 11.75" 3 13.5 watts
Quad 14.5" 4 18 watts
Microprocessor Control Pump Speed Max Flow Per Pump
RPM l/hr ml/min gph
Integrated 10 1.5 25 0.4
Pump Hose
Motor Life Pump Hose
Pump Hose
Silicone Grease 10,000 hrs Santoprene 3 million turns
Finest Cycle Time Duration Max. Cycle Time Duration Finest On Time Duration Max On Time Duration
1 second 99hrs 59min 1 second 99hrs 59min


Pump specifications (for each pump):
  • Capacity: 0.4gal (1.5Lph)
  • Maximum head: 10m/ 30ft - 1bar/14.5psi
  • Pump Hose: Santoprene® (Santoprene, for long lifetime)
  • Power Consumption: 4.5W
  • Dimension: 9" x 3.25" x 4.5"


  • Use to dose two part calcium solutions, with the ability to separate the A & B doses with an appropriate time lapse to ensure they don`t interact within the sump volume.
  • Use to automate trace element additions to ensure exact dosages, added steadily over your desired time interval.
  • Use for regular plankton feedings from your Plankton Reactor or Plankton Light Reactor to keep a steady supply of live food available for your filter feeding invertebrates.
  • Using the included one-way check valve (always on the suction side) ensures positive progress of the fluid through the dosing line while eliminating back-siphoning.
  • Replace the persitaltic tube periodically, depending on severity of duty, to maintain performance.

  • Manufacturer Info

    Aqua Medic Aquarium Supplies
    Aqua Medic has been a prominent name in the aquarium industry for over 22 years. The company was founded in Bissendorf, Germany and opened a North America distribution center in 2002 to better serve hobbyists in the United States and Canada. As the company continually introduces new products from the European market into North America they also provide excellent service for all of their products and carries a wide variety of replacements parts. Their open relationship with customers welcomes suggestions and user feedback. We carry a variety of Aqua Medic aquarium supplies including pumps, protein skimmers, light fixtures and accessories.


    1 year manufacturer warranty on most products

    Aqua Medic Reefdoser Dosing Pump Twin Reviews

    Average Rating
    (14 reviews)
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    of 2

    Don't buy this

    Reviewers Rating Unsatisfactory

    Posted: 6/6/2010 from BROOKLYN, NY UNITED STATES
    1.0 5
    Experience Level: Expert

    Comments: One of the most attractive dosers. A lot of people seem to hate the programing method for this dosers because it is not the norm, I love the programing method of it, I can dose every second, minute, hour , day or week if I chose to, simply by telling it dose x amount every 2 hours or 36 hours or 48 hours and so on, love the programing of it, everything else I hate the tubes last about 4 mounts no matter how much or little you use it and $20 a pop each, every pump even when set to identical times doses very deferent amounts, big problem with back syphon even with chick vales. Rotating wheels cracked after a year. Had mine for about 3 years and finally decided to give up on it. For the price I would have expected more. Don’t buy this; there are cheaper and more accurate ones out there.

    7 of 7 People found this review helpful, did you? Yes No

    Reef Doser

    Reviewers Rating Average

    Posted: 7/6/2009 from TOMBALL, TX UNITED STATES
    3.0 5
    Experience Level: Intermediate

    Comments: I like this product well enough. If you want something to run in the middle of the night, you have to stay up until the middle of the night to start it since it doesn't use the clock, but uses intervals of time. I had to do this because one of the pumps is not air tight. So I have to fix this.

    1 of 1 People found this review helpful, did you? Yes No

    good, but WARNING!!!

    Reviewers Rating Average

    Posted: 7/9/2008 from SACRAMENTO, CA UNITED STATES
    3.0 5
    Experience Level: Expert

    Comments: The pumping mechanism is great and works perfectly, even for tiny doses (like 1 drop). HOWEVER, I have a big problem with the design...the programming is ridiculous, I'm not even sure I want to keep the thing. It only allows you to program in "cycles," not by a clock. In other words, you can only have it dose, say, once per day, every hour, every half-hour, every 10 mins, every 5 hours...whatever "cycle" you want. IT WILL NOT LET YOU dose for only certain parts of the 24 hour day, say night-time. For example, I'd like to dose kalkwasser every hour from 10PM until 8AM, but there is no possible way to do this. If you think you can just set the whole system on a timer itself (so that it would only be powered at night), this won't work...the system resets after a power outage and you have to do a sort of soft reset (by pressing two buttons simultaneously) to have it start the programs again. The pumping operation is a perfect answer for dosing, but due to the lack of programming ability, I don't recommend this product, you'll only get frustrated trying to figure out how to "time" things for a decent "cycle."

    9 of 9 People found this review helpful, did you? Yes No

    Great, but use check valve!

    Reviewers Rating Great

    Posted: 6/16/2008 from AUSTIN, TX UNITED STATES
    4.0 5
    Experience Level: Expert

    Comments: I was ready to return this unit as useless until I finally noticed the Tips and Tricks section of the product page here on Marine Depot! The manual doesn't tell you this: If you install the pump where it is above your source, you MUST use a check valve on the INPUT side (the manual shows the check valve on the output side). Without the check valve, the pump is never able to draw the additive up out of the reservoir, it just goes up one inch, then right back down, over and over. So, it's not nearly as foolproof as the LitreMeter III I run on my other tank, but at less than half the price, I'd say it's worth the hassle factor. The physical build quality of this unit is impressive, better in fact than the much more expensive LitreMeter.

    0 of 6 People found this review helpful, did you? Yes No

    what else do I need?

    Reviewers Rating Unsatisfactory

    Posted: 5/5/2008 from ALAMEDA, CA UNITED STATES
    1.0 5
    Experience Level: Expert

    Comments: The product does not ship ready to use. I need to purchase tubing and manufacture some sort of bottle-hose connector in order to put the thing to use. Also, the directions are confusing and don't provide any dosing time to amount of dosing information. This is a product of Poland and the english translation of the directions/instructions is poor. The directions also state that the tubes will randomly wear out at some point and don't provide instructins on how to purchase new ones. Not what I expected for $230!

    8 of 9 People found this review helpful, did you? Yes No


    Reviewers Rating Average

    Posted: 8/25/2007 from ORLANDO, FL UNITED STATES
    3.0 5
    Experience Level: Beginner

    Comments: Mechanically it operates fine but the ease of understanding the display, programming and resetting the time cycles could be much better. Using it feels like I am an unqualified layman using a device specifically designed for and to be used by experts. It's not very consumer-friendly. When I press the wrong buttons to reset the unit the display flashes illegible numbers rapidly which requires unplugging and replugging the unit's power cord to the outlet.

    1 of 1 People found this review helpful, did you? Yes No

    AM review

    Reviewers Rating Average

    Posted: 8/15/2007
    3.0 5
    Experience Level: Intermediate

    Comments: Does an ok job. The main problem is that the santoprene tubing keeps slipping out of the peristaltic wheel rendering it useless. Also the dosing is not quite accurate due to air bubbles backing up in the output tubing (tubing from the unit to your tank). This occurs when the doser is off. So the first few seconds of its on cycle, the unit is only pushing out air until liquid fills up the output tubing. I haven't tried the spectrapure liter meter but I have heard great reviews only.

    5 of 7 People found this review helpful, did you? Yes No

    Nice doser

    Reviewers Rating Excellent!

    Posted: 8/6/2007 from MERRITT ISLAND, FL UNITED STAT
    5.0 5
    Experience Level: Intermediate

    Comments: Besides figuring out the instructions this is a nice doser. Also, use a small UPS in case of power failure.

    2 of 2 People found this review helpful, did you? Yes No

    Dosing Pump

    Reviewers Rating Excellent!

    Posted: 7/10/2007 from SUN CITY WEST, AZ UNITED STATE
    5.0 5
    Experience Level: Expert

    Comments: The aqua medic works extremely well when setup properly. Instructions are not the best but they have a help number which is useful. Can program pumps individually and deliver the volume based on elapsed time since pump is of one speed. In power failures you must restart but program remins intact in memory. Best pumping system I have ever used.

    12 of 13 People found this review helpful, did you? Yes No

    Could be better

    Reviewers Rating Average

    Posted: 6/25/2007
    3.0 5

    Comments: I have two big problems with with this doser. First, documentation is poor, and controls are not user friendly. Second, it must be restarted manually if you lose power. Otherwise, a decent doser.

    11 of 34 People found this review helpful, did you? Yes No

    of 2
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