Copper sulfate, a naturally occurring and manufactured copper salt, is used as a fungicide on crops, as a pesticide to kill snails and slugs, and as water treatment to kill aquatic vegetation. This chemical has serious chronic toxicity with implications for agricultural workers and the environment.
1 Keep the refrigerator temperature at or below 40Â° F (4Â° C). 2  The freezer temperature should be 0Â° F (-18Â° C). 3  Check temperatures periodically. 4  Appliance thermometers are the best way of knowing these temperatures and are generally inexpensive.
1 A fridge should have a temperature of between 37Â°F(3Â°C) and 40Â°F (5Â°C). 2  Any higher and the food will go off, any lower and youâll lose nutrients and fresh food can be ruined. 3  The ideal freezer temperature is 0Â°F (-18Â°C) which will store food safely and stop bacteria forming.