1. (1) Existing treatment plants must comply with these requirements by December 31, 2007.

2. (2) Where a treatment process is necessary for the production of safe drinking water, such as chlorination or coagulation, a minimum of two sets of chemical feeders shall be provided. A standby unit or combination of units of sufficient capacity shall be made available to replace the largest unit during shutdowns. The capacity and design must comply with the following:

   1. (a) Feeders shall be able to deliver the necessary amounts of treatment chemical accurately at all times.
   2. (b) Feeders must be designed to prevent treatment chemicals from being siphoned into the water supply.
   3. (c) Service water supply lines must be equipped with backflow prevention devices or an air gap must be provided between the supply line and solution tank.
   4. (d) Feeders and supply lines must be resistant to the aggressiveness of the chemical solution.
   5. (e) A means for calibration of the amount of chemical being fed should be available for each individual chemical feeder.
   6. (f) Chlorine feed systems must be capable of accurately determining the amount of chemical being fed at each individual point of application.

Author: Edgar K. Hughes

Statutory Authority: Code of Ala. 1975, §§22-23-33, 22-23-49, 22-22A-5, 22-22A-6.

Editor’s Note: Rule 335-7-6-.20 was previously Rule 335-7-6-.19 per certification filed May 2, 2000; effective June 6, 2000.

History: May 23, 1977. Repealed and Readopted: January 4, 1989; October 31, 1990; effective December 5, 1990. (Rule was renumbered from .11 to .19, as per certification filed December 21, 1998; effective January 25, 1999, with no changes made to the rule.) Amended: Filed May 2, 2000; effective June 6, 2000. Repealed and New Rule: Filed November 7, 2005; effective December 12, 2005.