When I first started keeping reef tanks 20+ years ago I dosed a two part solution for calcium and alkalinity supplementation. I figured out what I needed to add and dumped each solution in manually at different times during the day. Was it a pain in the ass? Yes, but reliable automatic dosers back then were just not available.
Eventually, I purchased a medical grade dosing pump but that proved to be unreliable, leading me to switch to a calcium reactor. The calcium reactor served me very well over the years since it was pretty much a set it and forget it piece of equipment. Every six months I would change out the media and maybe 1x a year I would re-fill the C02 tank.
Time to Reconsider Dosing
However, the reactor did lower pH due to the injection of C02, requiring me to use a kalk reactor to boost pH, a pain since I had to deal with another piece of equipment and more maintenance. Ultimately, I felt it was time to reconsider dosing since the technology on that front had advanced significantly over the years.
I researched a couple of different options and sought feedback from some fellow reef keepers to get their take on what they liked and didn’t like about the units they owned. Armed with this information, I settled on the GHL Doser 2.1 SA, which has four dosing channels.
GHL Doser 2.1 SA: Key Features
- Built-in Wifi. No need to plug in an ethernet cable to connect to a network
- Ability to access the doser remotely via the myGHL cloud service
- Built-in temperature port and level sensor port for automatic top off devices and small volume automatic water changes
- Doser can be expanded with the use of upgrade kits. So a 2 or 3 pump doser can be expanded to a 3 or 4 pump doser. You can actually have up to 16 total dosing pump motors run off of one standalone GHL Doser 2.1 SA or the ProfiLux 4 controller
- Fluid monitoring feature, which automatically calculates the approximate number of remaining days before a container runs dry
- Full 2 year warranty
Ok, so what are my personal observations of the doser? First of all, I find the unit especially easy to use. There are buttons on the front of the doser that can be pressed for manual dosing or you can use the app to do the same thing or check to see how much solution you have left.
The online interface that accesses the cloud is intuitive as well. You can opt for preset automatic settings or set up your own manual schedules if you want to dose during a specific time period and/or on certain days. Another really neat feature is the blinking GHL logo at the top of unit. A blue/magenta pulse of light means the unit is operating correctly while a yellow pulse of light means it is time to refill your dosing containers. There are other light cues as well.
The Bottom Line
Overall, I have been using the GHL Doser 2.1 SA it for a few months and I couldn’t be happier. Talk about set it and forget it! An extremely reliable unit capable of precision dosing. What more could you ask for.
If you would like some help with a new tank build, including help designing a custom aquarium, or help re-configuring your current setup then you can visit this page for more information. And if you are looking to add some equipment, I do sell GHL, Pax Bellum, Reef Octopus Calcium and Kalk Reactors and Royal Exclusiv products, including Dreamboxes, which is the equipment I use and recommend. I also sell Reef Brite metal halide and LED fixtures as well as Maxspect & IceCap Gyres.
As for additional insights and information, please explore my many other reef tank and SPS related articles as well as my YouTube channel. For an even deeper dive into reef tank care you can check out my Reef Keeping Master Class. This online course is an immersive and one of a kind educational tool designed to help reef aquarium hobbyists build and maintain a beautiful SPS reef tank. The course is a series of video presentations with some supplemental video from my YouTube channel. There are also quizzes to help students retain and understand the information presented in the course.
Need some frags…..I can help with that as well 🙂 Please visit my SPS Frag store to see what is available.