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.
Various Answers The refrigerator should be at about 35Â°F (1.6Â°C) which is above freezing, so your milk won't freeze. The refrigerator should be set between 40Â°F and 34Â°F (~4.4Â°C to 1.1Â°C).The closer it gets to freezing (32Â°F or 0Â°C), the longer the food will keep.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. Try not to keep opening the fridge door every few minutes.