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This pump wouldn't be a very good choice for kalk as it isn't meant to run for that long. For kalk you would want to look at something like the 50mL doser which is faster and wouldn't need to run as long.
it is able to handle up to 2 pumps and has independently controlled outlets.
The actual flow rate on the pump is not adjustable. It will always flow at 1.5mL per minute that it is running. You control how much solution you are dosing by adjusting your timer and thus how long the pump itself runs for. If you want 15mL, you would run it for 10 minutes. If you wanted .75mL you would run it for a half a minute.
That is correct, it should go in the tube on the left and out the tube on the right (assuming the tubes are pointing towards you).
The flow rate of a Drew's Doser is intentionally 1.6mL per minute which makes it too slow for most auto top off needs. With the addition of an inexpensive digital timer Drew's Dosers will provide a fully automated calcium and alkalinity dosing solution. Two Drew's Dosers are necessary to dose 2 Part. The tubing set typically lasts 1-2 years depending on amount of use. Each Drew's Doser includes 10ft of tubing. Please note that the flow rate of each pump will vary slightly and should be tested before use to determine the exact flow rate. BulkReefSupply.com offers a full 1 year replacement warranty on all Drew's Dosers.
We do not suggest using this pump for auto top off systems.
Great pumps - don't forget to measure output By Joseph B on 8/17/2015Joseph B would recommend this product to a friendI bought two these pumps to add macro and micro nutrients to my freshwater planted amazon bio-type system consisting of 200 gallons. I bought these pumps on the recommendation of another freshwater aquarist and was hoping they would deliver a bit more than the BRS two roller pumps. I did not expect them to be spot on at 1.6 ml/min but was a bit disappointed that one is 1.3 and the other is 1.2 ml/min. Great pumps I just have adjust running time and concentration to do what I need to do.
Dosing made easy By hans on 10/17/2013hans would recommend this product to a friendI have 2 of these for calcium and alk. I have them hooked up to my Apex controller and it makes dosing easy. Much more consistent way of dosing compared to hand dosing. Set and forget. Make sure to check Ml per minute, mine were a little under what it was rated. Other than that no complaints here
Doser and levels are in check for last 6 months. By SloppyWhenWet on 10/9/2013SloppyWhenWet would recommend this product to a friendI use two drew dosers to maintain my levels with 2 part. Working well and only time will tell but so far so good.
glad I bought them ! By maria on 6/13/2013maria would recommend this product to a friendBought two of these and so happy I did. No guessing pretty much just set
and forget. Adjustments will need to be made over time as corals continue to grow and demand increases, but what a pleasure to know the tank is being dosed the exact amount everyday !! Sorry I waited so long !!
Best Dosing Pump I Have By Peter on 5/6/2013Peter would recommend this product to a friendI would highly recommend the Drew's dosing pump. The tubes are better with the BRS dosing pump which I have two of, but this is a much better pump in my opinion. I use this for the calcium portion of my dosing. If I was doing it over I would buy this pump for all of my dosing pumps.
Great Pumps By Terry on 2/23/2013Terry would recommend this product to a friendAt first I wasn't going to spend the extra for these pumps but now that they are up and running, I'm glad that I did. Great pumps. Spend a little more for these pumps and don't worry about if you made the right decision or not.
Short cords By MAtt on 6/2/2012MAtt would recommend this product to a friendThe cords could be a bit longer. Its much better to wire tie than to try to stretch a cord! Otherwise they seem ok, but too new to tell.
Excellent product By James on 3/14/2012James would recommend this product to a friendI've used the Drew's Doser for over 2 years. I use it to dose Soda Ash daily in my 120g sps dominated reef display tank. It's been very reliable and is easy to operate.
just installed great doser By reefez on 3/11/2012reefez would recommend this product to a friendI just installed two of these dosers very easy to do W/reefkeeper lite only down side for me is that both dosers had different out puts .So a little timer management and I am good to go. Very happy with my choice so far.
Makes life much easier. By Kevin on 9/27/2011Kevin would recommend this product to a friendBought two of these along with the Eco Plus Dual digital timers here to set up my 2 part dosing system. The pumps work quietly and accurately. The corals in my tank look so much better now that Calc/Alk levels are stable. Due to the initial up front cost, I was a bit hesitant to set up this system. Using the bulk supplements however saves alot of money long term. (Compare a bottle of prepared liquid Ca at $12-15ea to the 7lbs of powdered for the same price which makes 8 gal. of prepared liquid Ca.) The pumps feel solid and run smooth and quite.
great little pump for dosing By mjd on 7/4/2011mjd would recommend this product to a friendSwitched to these pumps after having troubles with the BRS dosers (read review there), and have never been happier! These are consistent, nearly silent, and haven't let me down in over 18 months of dosing. I am going to get a third to dose magnesium along with the 2 part!
Great pumps By Lance on 6/14/2011Lance would recommend this product to a friendI have a number of these and they work great!