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.
Average temperature of a refrigerator is 35 - 38 degrees and -18 Â°C (0 Â°F) for the freezer. A household refrigerator should be maintained between 34 and 40 degrees Fahrenheit-just above freezing to maintain food quality but low enough to inhibit bacterial growth.Ideally your refrigerator should be at the correct temperature (less than 4Â°C). When the fridge is very full, turn thermostat to Colder setting.reezer temperature should be maintained at minus 18Â°C. (Ice cream is a good indicator of freezer temperature: it should be firm.) Consult your fridge manufacturer's manual for advise on temperature control.