Cutrine Plus Liquid is a chelated copper algaecide that stays active and is safer to use than copper sulfate. Use liquid Cutrine for surface or suspended algae. Dosage rates: 0.6 to 1.2 gallons per acre. No water restrictions. Apply by sprayer to surface. For best results use activator (Cide Kick) with Cutrine. Stocktrine is diluted algaecide for use in garden pools, stock tanks and other small bodies of water where fish are not present. Please Note: The following states restrict this EPA Registered Chemical: States: AK, CA, CT, ID, HI, ME, MA, NH, NJ, NY, RI, VT, WA.