you should be fine using the salt. whether you stay with the same brand name or change, any new bucket or bag of salt you start to use you should check all the levels of your freshly mixed salt water before adding to your tank. even from the same name brand your levels can be different from batch to batch. what i would do when i was going to start a new bucket of salt was mix half the old salt with half the new salt during my mixing. ie one cup old bucket, once cup new bucket. then if there is any change it will be gradual for the tank.
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