Filters keep the water clean for the fish, kind of like we need clean air to breath properly. Also, filters keep the tank clean by (yep you guessed it) filtering the water. I hope this helped^^

The use of air filters is to clean the environment or the air. The air filters are effective in getting rid of material such as dust, bacteria or pollen form the air.

They can clean water using filters.

typically, filters are used to clean air in both , however, in cars their also used to clean oil, and homes their used to clean water.

Yes, it will be clean because the air filters the pee.