You will be much happier with aluminum sulphate. There are several formulas. Just give it some time(2 wks..to work, before re-assessing. Make a slurry with 1 tablespoon per gallon, that gives you a 1/250 ratio, then add 1, 2, 3, etc. tablespoons per gallon of the slurry to gallons of fresh water(you can use 1 teaspoon per quart and be close). The least amount to settle the solids is the amount to use. However much alum you use, add 40% that amount of hydrated or quick lime to maintain the ph. If you need to raise the ph a little, add more lime. I used 150# alum, followed by 100# lime in 3 increments about 2 wks. apart. My water went from 12 inch muddy visibility to 4 ft. clear in a month. Then slowly added fert. til now I have a nice green 24 inch bloom. This took about 3 months total. That is for about 1 million gallons.