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Filters - Loading Rates and Backwash Criteria

FILTER LOADING RATES AND BACKWASH CRITERIA EXTENSIONS   PART (X) MODEL MEDIA TYPE  LOADING (GPM/FT2) BW (1) (GPM) 3 -N NEUTRALIZING MEDIA CALCITE AND GMO 3-6(4)  10-12 4 -T FILTER AG (SILICATE MEDIA) 3-5(6) 8-10 5 -S FILTER SAND 2-3(7) 15 6 -I MANGANESE GREEN SAND  3-5(5) 10-12 7 -C ACTIVATED CARBON 2-6(3) 8-10 8 -MM MULTI MEDIA 3-8(2) 15     (1)    EXACT BW RATE VARIES WITH FILTER SIZE DUE TO FIXED RATE BW CONTROLLERS (2)    “A NUMBER OF INVESTIGATORS FOUND DUAL AND MIXED MEDIA FILTERS TO OPERATE SUCCESSFULLY AT RATES FROM 3 TO 8 GPM/FT2” AWWA, ASCE WATER TREATMENT PLANT DESIGN, 3RD EDITION, MCGRAW HILL, NY,NY 1997 P 158 WATER KING RECOMMENDS 3 GPM/FT2 WITH ALL FILTERS IN SERVICE AND 5 TO 6 GPM/FT2 WITH ONE OUT OF SERVICE AND PEAK FLOW.  (3)    “SURFACE LOADING RATES FOR GAC FILTERS RANGE FROM 2 TO 10 GPM/FT2, ALTHOUGH RATES OF 2 TO 6 GPM/FT2 ARE MORE COMMONLY USED AS DESIGN CRITERIA. (4)    PER CLACK BROCHURES 2386 (11/02) AND 2387 (1/02) LISTING CALCITE AT 3 TO 6 GPM/FT2 AND CORSEX AT 5 TO 6 GPM/FT2, RESPECTIVELY. WATER KING USES A MIX CALCITE AND CORSEX HENCE THE RECOMMENDED LOADING OF 3 TO 6 GPM/FT2. (5)    PER CLACK BROCHURE 2349 (03/01) MANGANESE GREEN SAND AT 3 TO 5 GPM/FT2. CLACK ALSO NOTES “8 – 10 GPM/FT2 INTERMITTENT FLOW POSSIBLE”. WATER KING RECOMMENDS 3 GPM/FT2 WITH ALL FILTERS IN SERVICE AND 5 TO 6 GPM/FT2 WITH ONE OUT OF SERVICE AND PEAK FLOW. (6)    PER CLACK BROCHURE 2351 (03/01) FILTER AG RATE LISTED AS 5 GPM/FT2 WITH NOTE THAT “CONSIDERABLY HIGHER RATES ARE OFTEN USED”. WATER KING RECOMMENDS 3 GPM/FT2 WITH ALL FILTERS IN SERVICE AND 5 TO 6 GPM/FT2 WITH ONE OUT OF SERVICE AND PEAK FLOW. (7)    RAPID SAND FILTER RATES ARE TRADITIONALLY 2 GPM/FT2 FOR MUNICIPAL SERVICE. INDUSTRIAL RATES ARE LISTED BY CLACK AT 3 GPM/FT2 WITH DOMESTIC AT 5 GPM/FT2. WATER KING RECOMMENDS DESIGN OF SAND FILTERS NOT EXCEED 3 GPM/FT2 AT PEAK FLOW WITH ONE FILTER OUT OF SERVICE. IF HIGHER FLOWS ARE DESIRED, USE A MULTI MEDIA FILTER.

FILTER VESSEL BW RATE FOR MEDIA TYPE PART NO MODEL TANK -MM -I, -S, -N -C, -T 919005 FRF 50 12x52 FRP 10 8 6 919007 FRF 70 13x54 FRP 12 10 8 919010 FRF 100 14x65 FRP 15 15 10 919012 FRF 120 16x65 FRP 20 15 12 919015 FRF 150 21x62 FRP 35 30 20 919024 FRF 240 24x72 FRP 50 35 25 919030 FRF 300 30x72 FRP 70 60 40 919060 FRF 600 36x72 FRP (1) (1) 60 929015 FMF 150 20x54 STEEL 35 30 20 929024 FMF 240 24x54 STEEL 50 35 25 929030 FMF 300 30x60 STEEL 70 60 40 929060 FMF 600 36x60 STEEL (1) (1) 60 941000 FVN 20 20x54 STEEL 35 25 20 941001 FVN 24 24x54 STEEL 50 35 25 941002 FVN 30 30x60 STEEL 70 60 40 941003 FVN 36 36x60 STEEL 100 90 60 941004 FVN 42 42x72 STEEL 140 115 90 941005 FVN 48 48x72 STEEL 200 160 110 941006 FVN 54 54x72 STEEL 240 200 140 941007 FVN 60 60x72 STEEL 300 250 170 941008 FVN 66 66x72 STEEL 350 300 200 941009 FVN 72 72x72 STEEL 425 350 250 MODEL NO EXTENSIONS MEDIA TYPE MM MULTI MEDIA I GREEN SAND S FILTER SAND N NEUTRALIZING MEDIA CALCITE AND GMO C ACTIVATED CARBON T FILTER AG (SILICATE MEDIA) (1) Maximum BW for TM III used in FRF and FMF filters is 70 gpm. FRF MM, Sand, Neutralizing Filters and Greensand available up to 30" diameter (Model 300) FRF Carbon and Filter AG up to 36" diameter (Model 600)