hey! i used the instant ocean until i read about all the chemicals it has in it, i love seachem, salinity, it works well. also love brightwell products, i recently tried out a bucket of red sea for the lfs and i liked it as well, its supposed to be dried out sea water and the salt is collected up and packaged so they say NO chamicals, but for the best bang for your buck, id say go with seachem salinity, 80$ on average for a bucket around here, and it does 225 gallons where most buckets only go 160.