WSO Water Distribution, Class C/D Supplement to Grades 1 & 2 Textbook.  Includes:

WSO Water Treatment Grade 1
Chapter 5 - Groundwater Quality & Wells
Chapter 11 - Disinfection
Chapter 13 - Fluoridation

These textbooks are reserved for our In-Person classes.  Any orders for Virtual Classes or otherwise require shipment, will incur an additional shipping fee of $15.