Thanks but I already have 30 pounds of Talapia in the pond. Like I stated, just too much of a nutrient load going in. I also use muck eating bacteria when I can but it cannot be used within 2 weeks of putting in the Cutrine. I use the Cutrine very sparingly to avoid build up as much as possible. I did find a bacteria that is suposedly cold water tolerant and plan to try it over our mild winters we have to get a jump on that.