I use two part only through my Auquatronica controller with dosing pump. I have a 90g tank with about 20 gallons in the sump. I go through about a gallon of alk and ca about every 4-5 weeks. For me, this is the best method because of the control I have over the levels. I do have a 5g bucket of Calkwasser mix and a brand new Koralin calcium reactor that I haven't touched. If I go to a bigger tank, I'll no doubt move up to the Ca reactor with Kalk topoff and use the two part to adjust levels.
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