TM 10-4610-229-10
2-6. MULTIMEDIA FILTER BACKWASH (CONT)
BACKWASH FLOW RATES
Temperature
Slow Backwash
Fast Backwash
°F
gpm
gpm
55
115
180
60
125
200
65
135
220
70
144
240
75
153
255
80
162
270
85
170
285
90
177
300
95
184
315
100
191
325
105
198
334
110
204
342
115
210
350
120
216
355
125
222
360
12 Turn valve V-6 left or right to adjust flow rate to FI-1 to slow backwash rate listed in step 11. Increase raw
water and boost pump engine speeds if necessary to maintain flow rate.
2-111