I have two 30 gal
trashcans. One hold fresh RO
water for topping off my tanks and making KALK
mix. The other trashcan I fill with RO
water and then drop in a heater and powerhead. Once the water is up to tank temp I slowly sift in my salt mix till I have a SG
close to 1.025. I do let the water sit for at least 24hours from when i add the salt till i check the SG
I try to keep at least 20 gal
of saltwater mixed up at any given time just in case. This also allows my saltwater to age some prior to adding it to my tanks.