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To remove impurities
Filters are used to take impurities out of something. So you have to occasionally change your filters so they continue to take out the impurities.
Spleen
the spleen
Brita filters claim to remove chemicals such as chlorine as well as mercury, cadmium, lead and other impurities. The fact of the matter is due to the fine granite filters that attract the metals it removes mostly any impurities you have in your water.
The lymph nodes filters impurities and becomes swollen during infections. They will trap any foreign proteins as well as germs that may try to get into the body.
It filters reusable substances
The answer is: D) lymph node.
Lymph Nodes
Carbon
First it adds salt to the water, then it runs the salt water through a series of filters. The filters pull the salt back out of the water, and the salt tends to cling to other impurities. So as the salt is pulled out of the water, many other impurities that would normally not be affected by the filters are removed with the salt.
The answer is: D) lymph node.