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BRS Top Off Doser – 50 mL per minute

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BRS Top Off Doser – 50 mL per minute

72% Recommend this to a friend (48 of 67)

SKU: 202319

reg. $89.99

Special Price: $80.99

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Quick Overview

Ideal for auto top off applications. Our peristaltic pump has a slow, predictable 50 mL per minute flow rate which ensures gradual and subtle changes to water chemistry. Precision two roller design extends pump life and will not back siphon. 12 month warranty offered by Bulk Reef Supply.

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Product Questions

What are the general dimensions of the body of the BRS top off doser 50ml/min ?
Question by: jordan on Nov 30, 2013 2:49:00 PM
Hey Jordan,
It measures about 4.5"x3.5" and about 4.5" tall.
Answer by: Bulk Reef Supply on Nov 30, 2013 2:49:00 PM
Can this be used reliably with kalkwasser?
Question by: Philip on Aug 3, 2014 8:20:00 PM
Hi Philip,
It sure can. The peristaltic tubing is made from Santoprene which won't be bothered by the Kalkwasser.
Answer by: Bulk Reef Supply on Aug 3, 2014 8:20:00 PM
what size of tubing does this pump use?
Question by: Greg on Mar 11, 2014 4:24:00 AM
Hi Greg,
The pump does come with plenty of tubing but if you needed more 1/4" tubing like 1/4" RO tubing works really well.
Answer by: Bulk Reef Supply on Mar 11, 2014 4:24:00 AM
Does the reservoir have to be above or below the pump/tank for this to work?
Question by: Steve on Mar 12, 2014 7:05:00 AM
For this particular pump it doesn't matter as they won't create a siphon, though its always best practice to pump from a lower position to a higher position to make sure there isn't any risk of a siphon should something go wrong.
Answer by: Bulk Reef Supply on Mar 12, 2014 7:05:00 AM
I have a 36 gallon with no sump (using CPR Aguafuge 2 HOB). Is it possible to mount this below the display and pump up to the main tank? I'm not sure what kind of suction/pressure this provides.

I have this temporarily mounted next to the display, but I'd like to clear up my 'install'.

I'd also like to start into 2 part with the 1.1ml versions and was wondering if I could do the same with them, mount them under the main display and pump up the 26-30 inches total (from stand to display via tubing).
Question by: Scott on Jan 20, 2014 4:41:00 AM
Hi Scott,
Its not a problem at all to mount the pumps below the tank. They will easily draw up a standard tank height and they will push up to 20ft of head pressure. It would be no problem with the 1.1mL models either!
Answer by: Bulk Reef Supply on Jan 20, 2014 4:41:00 AM
Hi, can i hook up this pump to my ro di low pressure tank? for auto top off.
Question by: william on Jul 6, 2014 10:15:00 AM
Hi William,
When you say low pressure tank, is it a pressurized tank at all, or is it what we would call an "atmospheric" tank like a barrel or bucket? The later would not be any issue at all.
Answer by: Bulk Reef Supply on Jul 6, 2014 10:15:00 AM

Full Details

BRS Top Off Doser Specs

  • 20 ft max head
  • 50mL/min flow rate is ideal for most top off systems
  • Will not back siphon
  • Precision two roller design extends pump life
  • Dimensions: 4" x 3.25" x 4.5"
  • 12 month tube life (at 4 hours of use per day)
  • 12 month Bulk Reef Supply warranty on pump motor and head
  • Includes 17 ft of tubing, mounting bracket, and directions


BRS Top Off Dosers are intermittent duty pumps and not meant for continuous operation. We recommend on/off cycles under a few hours to maximize life span. This is a higher RPM motor than the BRS 2 Part Doser and may make a small amount of noise in operation but is much quieter than most dosing pumps in this flow rate range. Mounting the pump to the inside of a wooden stand will amplify sound.



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  • great while they work By keith on 6/13/2015

    I use three of these with my Apex,one for ATO, and two for salt water change out. They work great, but fail suddenly, as others have said 15-18 months. I keep a spare, but at $90 a pop I'm tired of changing them out.
  • Works great until it breaks, not durable By Mac on 6/8/2015

    These things work fantastically, but I've found they are not durable at all. I've bought several of these to add top-off water to my tank in tandem with a float switch. They last somewhere between 9 and 15 months. Reps have told me you can extend the lifetime by replacing the plastic tubing inside, but those are like $12 apiece, they should come with additional ones for free. I usually get between 10-14 months out of these things before they die on me. If it's under a year, they are still under warranty and BRS is great about replacing them. If it's over a year, warranty is past and I've gotta buy a new one. But they work so well when they do work that I keep buying/replacing them rather than looking for other solutions for my top-off water.
  • Great, but a little noisy. By John on 6/2/2015

    I use this pump for my top off and it does a great job. My only complaint is, when it starts up there's a loud knocking sound and it's noisy when running. It's not super loud, but it can get annoying after a while.
  • Good product By Chris on 3/23/2015

    I haven't had the durability problems that some others have reported. It is really the only option if you need more precise control over your top-off [I don't use float switch control, my pump runs for a set number of minutes each day and I make minor adjustments every 3 or 4 months to reflect the rate of evaporation in my tank.] It is also one of the only ways to run a top off system requiring a large lifting height.
  • cautions, but good product By Wade on 3/23/2015

    Overall a good product, but be warned that heavy application (either lots of use of high pressure) will wear out the gearing. Mine failed at the 17 month mark. Motor turns, tubing is fine, but the gears are worn through. Have redundancy.
  • works good By mark on 3/17/2015

    I bought this to top off during the night with Kalk and use my regular top of with RO/DI during the day. Mine measure 43 ml/M with about 5 feet of total tubing and less than a foot of lift. works good so far and is quieter than the relay on the apex its hooked up to.
  • Works great as ATO By Russell on 3/4/2015

    Bought to serve as my auto top off pump controlled by Apex. Works well for that purpose. I like the noise, because it reminds me to check my ATO water to make sure it has enough RO/DI water.
  • Product is Good... Customer Service is Great! By PZCorp on 2/26/2015

    This unit seems to do an overall good performance for the most part. Runs a little hot if used for too long of periods. I have 3 units and one did go down, but the staff help me trouble shoot then since it was under warranty they replaced the unit with no hassle. I am sooo thankful I found BRS a couple years ago. I first used them for the RO savings and now almost exclusively buy all my products from them. The learning videos also are a HUGE part of their great customer service!!
  • Great pump for kalkstirrers By Mike on 2/6/2015

    I use this pump on my kalkstirrer. It is a solid, well built item that has never let me down. Precise amount dosed every time!
  • Grinding gears By Adam on 1/16/2015

    OK so there are pro's and con's to these pumps. The do exactly what they are supposed to do, the water level in my tank is very stable. The only issue I have had is the first one I owned the gears stripped out in it. If it was not for BRS's awesome customer service I would be stuck with a $90 plastic block.

    The second one has been running for a couple of weeks now and so far so good. If the gears are plastic then perhaps BRS should re-engineer these to have metal gears.

    All in all though this is a good product and worth the money.
  • 1 a year? By Jason on 12/12/2014

    Have my 2nd one of these just die on me again. Both lasted maybe a year. Gears are stripped.
  • Another failed pump By Kris on 11/15/2014

    Used this pump for top off water in my ATO setup. Lasted 13 months, almost to the day. Like many other, the plastic gears in the drive stripped out. The way I have my ATO set up, this pump could run a maximum of 2 hours a day, and only for 10 minutes at a time every two hours. $90 for 1 year to operate under those conditions is pretty bad IMO.

    When it was working, it could be quite noisy as well. That's not to say it always was, because every time it kicked on it was a surprise what kind of noise it would make. There were a few times where it was pretty quiet, though I stress few.

    Gave it 2 stars instead of 1 because at least it made it a year. Sadly these days that seems to be an accomplishment for products.

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