When I do water changes all I have done is fill my brute can with water, dump in the amount of salt required, plug in mixing pump & let it mix until there is no sign of salt, check salinity with refractometer if salinity is right in the tank it goes.
A for ATO I would not recommend direct from your RO, find another container around 50 gals and get 2 ATO like an Elos, JBJ or one of the other brands. Run one from your RO tank to your ATO tank and the other from ATO to sump.
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