Del MDV Mixing Degas Vessel for Spas has an innovative system to eradicate ozone off gassing in your pool or spa. When utilized in combination with a DELZONE Eclipse, Total Eclipse, or SpaEclipse series ozone system, the MDV (Mixing Degas Vessel) permits higher concentrations of ozone to be used. In order to understand the importance of ozonators you must first understand what it is they do.What we call "Ozone" gas is created when oxygen is exposed to ultraviolet light. You may know it as the same gas that makes up the protective layer outside the planet's atmosphere. When this "ozone gas" is distributed throughout your pool or spa water it simulates a strong sanitizer that eradicates almost all of the bacteria found in the water. Water that has been ozonated stays clearer and fresher for a greater amount of time than water that is only cleaned by chlorine or bromine. Browse our catalog and you'll be sure to find exactly what you need!!