I have started to switch from IO (my LFS mixes their own RO for $1 per gallon) to mixing my own using Oceanic. I have added 2 gallons of oceanic thus far. Before the switch, i had low calcium levels with high alkalinity. Now, my water has never been better!!! My calcium is at 420ppm, alk at 10dKH and my ph is 8.3. I have contimplated switching back and forth each week, but i don't know how wise that would be. I bought some b-ionic online this week, so i can simply dose for whatever may be lacking in the water.