I am in the process of digging a 1/4 acre pond. Mainly for cc and bg. I do not have a well to supply water to the pond so it will be filled by rain. The pond will be on 4 acres that also has a horse and chickens. I'm curious if I should use the rain runoff to fill and maintain the water level due to the animals around the pond? Will the water be polluted due to the animal droppings in the pasture where runoff will come from? The pond will be around 12 foot deep