Aquashade Lake and Pond Colorant jug (2.5 gal) category_range and pasture Mode of Action: Protoporphyrinogen oxidase Mode of Action: Protoporphyrinogen oxidase (PPO) inhibitor with uptake through weed roots and shoots and both soil and foliar activity ✔ Safe for use on established cool and warm season turfgrass species listed on the label this product is most effective in water deeper than two feet and works best when applied early in the season Aquashade is a professional grade blend of blue and yellow dyes designed to inhibit underwater aquatic plant and algae growth by shading specific portions of the sunlight spectrum (red orange and blue violet) required for photosynthesis