Table 14
FILTRATION OPERATION CRITERIA
FILTRATION TECHNOLOGY/MEDIA | MAXIMUM FILTRATION RATE(gpm/ft2) |
Conventional, Direct and In-Line | |
Gravity Filters with Single Media | 3 |
Gravity Filters with Deep Bed, Dual or Mixed Media | 6 |
Pressure Filters with Single Media | 2 |
Pressure Filters with Deep Bed, Dual or Mixed Media | 3 |
Slow Sand | 0.1 |
Diatomaceous Earth | 1.0 |
Wash. Admin. Code § 246-290-654
Statutory Authority: RCW 70.119A.180 and 43.20.050. 08-03-061, § 246-290-654, filed 1/14/08, effective 2/14/08. Statutory Authority: RCW 43.20.050(2) and (3) and 70.119A.080. 03-08-037, § 246-290-654, filed 3/27/03, effective 4/27/03. Statutory Authority: RCW 43.02.050 [43.20.050]. 99-07-021, § 246-290-654, filed 3/9/99, effective 4/9/99. Statutory Authority: RCW 43.20.050. 94-14-001, § 246-290-654, filed 6/22/94, effective 7/23/94; 93-08-011 (Order 352B), § 246-290-654, filed 3/25/93, effective 4/25/93.