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.
Last updated: 1 May, 2014. The ideal temperature setting for a refrigerator is 3ÂºC and for a freezer it's -18ÂºC. The only exceptions are fridge-freezers in the RB*** range, for which we recommend -19Â°C (as -18ÂºC isn't an available option for these models).