By coincidence, I just got finished mixing a quart of D76 a few minutes ago. I used water heated to about 140 degrees (F) and there were no solid particles floating around when I got through. Follow the directions for mixing by starting with a smaller amount of water than the final amount and pour the powder in slowly while continuously stirring. I'm unaware of any problem using water that is hotter than the 125 degrees (F) that is recommended. If using water hotter than that is contraindicated someone please let me know so I don't make that mistake again. Otherwise I think the key to dissolving all the powder right away is by using hotter water, pouring the powder slowly and stirring well. Good luck with your D76.(posted 8089 days ago)Dennis