PurAqua BNM50 Level Switch Lock Nut - A deep understanding of the inner workings of the best and most successful pools led to a partnership with Axiall Corporation since acquired by Westlake Chemical Corporation. Their commitment to excellence and iterative improvement is evident as when Don founded the company. They are a proud Accu-Tab® Specialist, offering Accu-Tab® and Acid Rite units and tablets in North and South Carolina, as well as Accu-Tab® replacement parts nationwide.