Bruce :

What does the brown water look like ? Is it a brown form of plankton? Greg refered to this as a red euglena bloom. We get it sometime when we have a green plankton die off in the warm season. It worries me because when it happens the pond activity falls rapidly. We have had no fish kills and the lakes are all over 6 acres. Greg stated that it is a sign of over ferility. Lately we have had this condition I think because of conditions like you described including the decay of dead pondweed which was sprayed but only about 1/2 acre spread out over a 16 acre pond. No aeration occurs but we have lots of wind caused wave action to aid in mixing. The lakes average deepth are about 9-10 ft. with little shallow water { less than 3 ft.}. What do you think-- any info here which helps ? ewest