I personally switched from 'aquatic gardens' or whatever petco's brand is to instant ocean.
I originally bought the petco stuff because, with a pals card, i could get buy one get 1 50% off or something...
Well, now with 2 tanks and this quarantining thing I'm doing, i'm going through the salt, and the little bags just aren't enough...
So i switched to instant ocean and bought a big pail of it. It was $60 for the pail, and I'm hoping it lasts a while...plus it's a notoriously good brand, so....