Dimension One Spas Vision Sanitizing System 01512-261 Vision Hot Tub Filter and Water Sanitizer The Dimension One Spas 01512-261 Vision Sanitizing Cartridge contains a natural silver compound that helps keep your water cleaner, longer, and with less effort for 6 months. Silver is a natural bactericide so the D-1 Vision System helps kill bacteria missed during the sanitizing or ozonation processes. Naturally kills bacteria and algae. Reduces chemical use allowing for fewer spa refills annually, saving you money. Improves water safety, maximizes bather comfort and reduces that chlorine smell.