I just started using it...... I'm in the process of switching from a 150 to a 300 gallon DD marineland tank. Was curious how accurate the salt would be so I got a little crazy and weighed my ro as I made it in a five gallon bucket. I made up 30 gallons of water in one brute can and 40 in the other and to the pound for accuracy. The salt is pretty easy to mix, you just have to keep your attention on making salt and make sure you don't lose track of how many cups you have added. It comes with a paper that tells you exactly how much of each part to add. You add salt and let it dissolve completely. Then you add the magnesium and let it dissolve completely. Then you add the liquid labeled A, let it mix for a minute and then you add B. It dissolves really quick and with in five to ten minutes it looks like you have nothing but water in the brute can. It also comes with four scoops that have a measuring spoon as a handle. The sizes are 1/4 tsp with a 1/4 cup, 1/2 tsp with a 1/3 cup, one tsp with a 1/2 cup and one tbsp with a cup and it also comes with a measuring cup that starts at 10 ml and goes to 250 ml and 2, 4, 6 and 8 ounces.
I have made 3 batches of 30 gallons and 1 batch of 40 gallons and every time when I check the salinity it is dead on 1.025 at 78 degrees. Another thing a like about the ESV salt is that I added the water to my tank about 30 minutes after I mixed it. Another thing I tried is to let the 40 gallon batch mix over night to see if there was any residue on the can and it was clean as when I started.
ESV is my new salt........