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.
Normally a domestic freezer is best set to â18 Â°C (0 Â°F) or colder, as that's what the expiration dates for many food items are based on. It's also a requirement for freezers in restaurants, supermarkets & other places that sell food (at least here in Europe) to maintain a temperature of at most -18 Â°C.A general purpose domestic fridge should be at around 1-4 Â°C (so, just above the freezing point, and below 5 Â°C).n order to keep food out of the Danger Zone, your fridge must be set between 32-40Â°F (0-4Â°C). Your freezer must be below 32Â°F (0Â°C). I keep mine as cold as it will go. Keep your freezer efficient by half-filling it with bottles of water.