Hi Dorothy. We appreciate you reaching out to us. Our whole house system is connected to the homes water main and is first point of contact. Once the tap water goes through our system it's purified water through out your home from any faucet opened. In addition, since our systems remove all chemicals and impurities, it makes a big difference on your skin and hair. Lastly, we use a media called Filtersorb SP3 to prevent and remove scale build up. This helps extend the life of your appliances and pipes within a home. A healthier lifestyle and the peace of mind knowing your water is safe and great quality to drink. Best Regards, Aquacubed