My system is ~350 gallons and I just picked up the 2 pump standalone profilux doser last weekend. I get my Calcium and magnesium from the
Chemmaster and mix it myself. I have been dosing Randy's recipe manually for the past couple years with good results but having the doser will keep my system that much more stable. A good investment IMO but I don't have any experience with CA reactors so I can't make a comparison.