I have been rotating water changes between KZ's and Seachem Reefsalt. The reason I still do some water changes using Seachem Reefsalt is because it is very high in potassium. High enough that I have stopped dosing K-Balance because my potassium levels stay in the 380's and a bucket of Seachem Reefsalt is about the same price as a 500ml bottle of K-Balance but lasts 4 times as long.