I prefer the small packs...I dun change so much every week leh...but really convenient for setups...I dumped the whole packet in that time...no need measure....cos 1 box not enough...
Good Magnesium levels for this salt...calcium is good too....only kH needs a little buffering but I heard from friends TM also got kH problems recently...
Been using this salt for many yrs liao.... ...no intention to change in near future...