The worldâ€TMs best water filtration system just got better! Adding a holding tank to the nano filter system can increase water flow speed by up to 60%. This allows those who need faster water flow or serve up larger amounts of water daily to still utilize the incredible nano filter without sacrificing water flow production. As you have come to expect from Chanson this is no ordinary tank! This tank is unique because, it is one of the only holding tanks on the market that is washable! Simply remove the top cap on the tank, and use some strong Chanson acid water to clean and sanitize the inside of the tank once a year.