NSF 50 Equipment for Swimming Pools Spas Hot Tubs and other Recreational Water Facilities establishes minimum materials, design, construction, and performance requirements for equipment included in the water circulation system of residential and public swimming pools, spas or hot tubs.
When i started reading the book I was nervous because of all the information but it helped so much with my exam.Joanna Gonzalez
This book provided my husband so much information and he passed his exam with flying colors ! Thank you Contractor Campus for the books also with the help of your courses!
Jess Marie