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.
A working fridge, between 2-4 deg celcius depending on the season. People like the fridge colder in summer and vice versa. This is of course a guess based on the principals of safe refrigeration between 0-4 deg celcius amd that fridges are designed to stay under 4 deg. I'm only thinking about this now but I wonder if a fridges hot to cold setting has the warmest temp.