Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Spraying during the spawn???

Cecil- sounds like they're using HYDROTHOL 191 (it has a 3-day fish consumption restriction). Same restriction applies to AQUATHOL K/SupK, but it doesn't tend to cause fish-departures like HYDROTHOL. Not many other products have a fish-consumption restriction, so I'd say it is a good bet they're using it to control shoreline algal growths. KD