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.
The FDA advises that you should keep the temperature of your fridge between 32 and 40 degrees Fahrenheit, preferably right in the middle of that range, at, say, 35 degrees. Set the temperature at 35, and you avoid the risk of frozen food (thatâs what the freezerâs for!) and you avoid the risk of spoilage.