Check the listing for details. BioGuard Banish 1 qt - 2 Pack. Condition: New. Listed at 77.98 USD. Banish is a fast-acting, highly effective, patented, non-foaming algicide that produces results in 24 hours! It kills all types of algae in swimming pools. Thanks to a patented chelant, Banish also prevents staining that commonly occurs with other copper-based algicides. Product Information: 3.3% copper pH 2.4 Highly effective pool algae destroyer and preventative Fast-acting formula produces results in 24 hours (when used in conjunction with BioGuard Shocks) Patented non-staining, non-foaming formula Kills and prevents green, mustard and black algae Works in chlorine and bromine pools Does not affect pH so pH adjustments are unnecessary after treatment. To prevent pool algae: Adjust pH to between 7.2-7.6 Establish and maintain proper chlorine or bromine levels. Vacuum leaves and other debris from your swimming pool. For weekly application intervals, add 1.5 fluid ounces per 10,000 gallons of pool water. For two week application intervals, add 3 fluid ounces per 10,000 gallons of pool water every other week. Apply more often if pool volume is diluted by heavy rain, frequent backwashing, or partial drain/refill. To prevent visible pool algae: Add 1 pound of BioGuard Burn Out Extreme per 10,000 gallons of pool water or 1 pound of Burn Out Extreme 35 per 6,000 gallons of pool water or 1 pound of BioGuard Smart Shock per 12,000 gallons of pool water