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.
Ideal Temperature Settings. 1  The ideal temperature settings for the French Door refrigerator are 0Â°F (-18Â°C) for the Freezer and 37Â°F (3Â°C) for the Fridge. 2  To adjust the temperature, follow these steps: Important: On models with touch sensative displays, touch the words Freezer and Fridge, not the icon or numbers.