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.
Recommended temperature for your fridge-freezer all year-round You should keep your fridge temperature set at 3Â°C/37.4F and your freezer set at -19Â°C/-2.2F (or -18Â°C/-0.4F, depending on your model) all year-round. Recommendations for positioning your fridge-freezer Ensure that your fridge-freezer is situated at least 5 cm from walls on both sides and 10 cm from the wall at the rear.