Celsius is a temperature scale where 0 C indicates the melting point of ice and 100 C indicates the steam point of water.Yup, it's the melting point of ice, not the freezing point of water.elsius is a temperature scale where 0 C indicates the melting point of ice and 100 C indicates the steam point of water.
Biological filters: Replace the carbon when the aquarium water turns cloudy, or at least once every two months. Chemical filters: Give the chemical filter a good cleaning out when it appears to be clogged, malfunctioning or working very slowly. More frequent cleanings may be needed if your fish is sick.
There are just as many water filters as water softeners. A carbon filter is a type of filter that will remove the most contaminants by itself. These filters are capable removing or reducing hundreds of contaminants in the water. A water softener is not something you need, however a water filter is always a good idea.