I just had this in one of my tanks. I used 1 tbsp. of Epsom salt for every 500 ml of water. Then I dropped in their portion of pellets for the day, stirred it, and let it sit for about 3 or 4 minutes. I poured most of the water into the sink, leaving only the pellets and a little bit of water in the measuring cup. I continued this for 5 days, gave it a 4 day break, did a water change, and then continued it for about 3 more days. hope this helps!