Over the years, a kalk reactor has always been an integral part of my reef keeping setup. I have used one to dose kalkwasser via my RODI top off to boost pH, which is lowered by my calcium reactor, and to augment my tank’s calcium and alkalinity levels. I did have reliability issues with the one plumbed into my old 225 gallon system so I was on the lookout for a more solid and trustworthy unit for my new 187 gallon setup. I did some homework and eventually settled on a My Reef Creations Nilsen (Kalk) Reactor. These reactors are available in small, medium and large sizes. I went with a medium, which has a footprint of 8-1/2 inches, 12 inches including the pump, and is 19-1/2 inches tall. Essentially, this unit
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