With so many uncertainties of what
really is the proper way to mix/store Red Sea Coral Pro Salt, we have all had to just do our best and hope for the best. I suspect that like most things every situation is different. Location of where the storage container is, do you keep the air on all the time, are you in a cold climate, warm climate, and many other factors.
I personally have a 75 Gallon container that starts with RODI water. I have a Neptune COR pump that is constantly circulating the water and a pump that is filtering the water which you will see later. COR Pump is normally just set to 50%.
Once a week I stop the filter pump and I turn the COR pump up to 100% and add the salt. The container is in my basement and the water (no heater involved) is usually around 72.5/22.5 degrees. Normally I'm doing this at night during the week since I work so usually I just let it mix overnight (I understand it's not recommended but fits for my lifestyle and time constraints). In the morning I'll turn the pump back down to 50% and then start my filter pump and circulate the water through the canister/filter to capture any of the nasties that might develop in the water.
Then on Sunday (my designated water change day), I'll do a 15% water change on my 60 Gallon and 10% change on my 240 Gallon. Sometimes a bigger one depending on if I have issues in the tank which is why I always like to have the bin full and ready.
Whatever I don't use stays in the bin and I just fill the remaining tank up with RODI again and rinse/repeat weekly. Sometimes I start mixing the salt on Wednesday, sometimes on Thursday or Friday or Saturday.....really just depends on what I have going on during the week.
Right or Wrong, just thought I would share what I do with this particular salt.