So I recently moved away from using a Calcium Reactor to dosing ESV 2 part. Tank is heavily stocked with SPS. I slowly moved away from the Reactor to the 2 Part and after a few days my Alk is running low to 7.3 from the previous number of 8.3. My Calc has stayed pretty steady. I'm dosing 65ml a day of both ESV parts. From what I have read it says to always dose in both parts equally. So if I want to get my ALK up I increase both parts and not just the ALK. Not sure if I even need to really worry about Calc going up higher its currently at 460.