The design of a particular whole house filter is made to filter out the contaminants you don't want in the household water supply. You may want to remove iron, hardness, or just chlorine. What whole house filtration system you need will be determined by what's in the water supply that needs filtering out. Your whole house water filter could include a water softener to remove iron, or it could be more elaborate and include a process called aeration or oxidation. The type of whole house filtration used is driven by what undesirable things are making water a problem for your home. Contact us at 310-372-3565 or info@bidonplumbing.com to get started.