I switched from IO to H2Ocean, and I still have to dose just the same. The only difference is that with IO I would add calcium, magnesium, and potassium to the fresh saltwater to get the parameters right before doing a water change; with H2Ocean I still have to add magnesium and potassium....so why am I paying $20 more for a pail that mixes up 40 gallons less? I don't know! The H2Ocean mixes up easier and cleaner, but honestly I notice no difference in my reef or dosing schedule.

Exact same experience here switching from IO to H2O so I returned to IO, but with Reef Crystal. Still 25$ less than H2O.