Physan 20 is an algaecide, fungicide, bactericide and virucide with an incredibly wide range of applications
PHYSAN 20 is effective at controlling algae and odor in fountains, birdbaths, swimming pools and decorative water displays. PHYSAN 20 is simple to apply, and safe around birds, mammals and plants. WARNING: PHYSAN 20 IS TOXIC TO FISH! It should not be used in the presence of fish.
Initial Dose: Add 1 teaspoon PHYSAN 20 per 52 gallons of water (I ounce per 312 gallons of water) to achieve a concentration of 5 parts per million. Weekly Dose: Add 1 teaspoon PHYSAN 20 per 104 gallons of water each week to maintain a concentration of 2-3 parts per million
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