Sanco TSUNAMI DQPond Weed Problems? Our aquatic herbicides are effective in controlling multiple types of pond weeds. Identifying which type of weed you have will determine which of our pond weed treatments to use. Tsunami DQ is a non selective herbicide for both submerged and floating pond weed control. Our products are effective in controlling duckweed, water hyacinth, pondweed, slender leaf pond weed, coontail and other aquatic weeds. Tsunami DQ can be blended