New tank and have NEVER done this before! We have 35gallon trash cans we are filling up with RODI water to do our salt mix in to start the first cycle for our new tank. My question is, do we just add the salt after they are filled and how long can the mix sit in the trash cans before adding to the tank? Don't want it to get stagnant. Have NO CLUE how to do this! Any and all advice is appreciated!

