This is the one where Rudy is talking about disinfection discussing chlorine types and characteristics as well as supplemental oxidationCPO Prep materials: CPO Practice Test & Prep?‍? - Aquatic Facility Training and Consultants (cpoclass.com)CPO Class Schedule: Aquatic Facility Training and Consultants - Get Certified with Pool Expert Rudy Stankowitz (cpoclass.com) Support the show - Click Here ✅ Enjoy the Talking Pools Podcast Network? Become a supporter. Buy a host a cup of coffee ☕ Support the show