Raven, when a pond turns pea soup color, the balance is wrong. The
"bad" bacteria have over come the "good" bacteria. In a natural eco
system, everything takes care of itself. I worked with a commercial
grower for walmart on her irrigation pond and helped her with her
water garden as well. She had the same pea soup and knowing her plants
like she did was dumbfounded as to what could be wrong. I introduced a
small amount of bacteria ( specifically made for aquatics) and treated
with a kelp extract. Three years later, her pond is still healthy.