Physan 20 For Use With Fountains, Birdbaths, and Decorative Water Displays:
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.
Mixing and application directions:
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.
Note: PHYSAN 20 should only be used in contained water displays that recirculate, not in ponds, estuaries, or other bodies of water that could drain into fish bearing waters.