See avatar and personal page pics. I used a 400 gallon tank and one-ton truck. Mixed urea and KCl. I did not have much trouble dissolving it--but I had to take special precautions to prevent urea from sucking into the filter. I planned to use 3 gals per thousand, but I walked fast enough--it eventually turned out to be about 2.6 gals per thousand sqft. I used about one bag for 68 gallons of water; 25 percent less at 80 degrees or more, 50 percent less at 85 degrees or more.
About 3 of five treatments were granular.