Yes I use that.... Google bulk reef supply and type in soda ash you can also get their gallon containers to mix it. I just ordered more today. You can also call them and they can give you any info you need they are also on utube for video on reef tanks.jist remember when you mix a gallon of it make sure you check out their calculations look at calculator and you put in your volume of water and what your parameters are and where you need to get to and they will tell you how much to use just do it over several days because your alkalinity is to low and you don't want to just pour it in one shot. Once its stable you won't need as much