Okla. Admin. Code § 252:624-7-2

Current through Vol. 41, No. 19, June 17, 2024

Section 252:624-7-2 - Additional maintenance requirements for slow sand filtration systems

(a)Source water turbidity. Slow sand filtration systems shall not receive source water with a turbidity of more than thirty (30) NTU.

(b)Finished water turbidity. The finished water turbidity of slow sand filtration systems shall be measured once per day while the minor public water supply system is in operation. The finished water turbidity must be below one (1.0) NTU.

(c)Filter sand depth and specifications. The depth of the filter sand in a slow sand filtration system shall be maintained at a depth of at least twenty-four inches (24"). Replacement filter media shall consist of clean silica with an effective size between 0.30 to 0.65 mm and a uniformity coefficient lower than 3.0.

(d)Maximum filtration rate. Slow sand filtration systems shall be operated so that the rate of filtration does not exceed fifty (50) gal/ft ² of filter area per day.

(e)Backwash. Slow sand filtration shall not be backwashed.

Okla. Admin. Code § 252:624-7-2

Added at 25 Ok Reg 2294, eff 7-11-08

Amended by Oklahoma Register, Volume 34, Issue 24, September 1, 2017, eff. 9/15/2017