Bacteria Filters are a vital part of keeping your water clean and healthy for you and your family. We offer many inexpensive ways to efficiently eliminate bacteria, viruses, and other unwanted contaminants. Well water can be at high risk for unwanted contaminants such as: ecoli, coliform, nitrates, iron, etc. Depending on the type of bacteria you have, there are different water filtration systems to treat it. Be wary of anyone telling you that you need retention tanks for iron bacteria. Retention tanks are normally only needed in cases of ecoli or coliform.