| Comparison Aspects |
Automatic Self-cleaning |
Pressure Sand Filter |
| Type Of Cleaning |
On line : Automatic |
Off line : Manual |
| Filtration During Backwash |
Continuous Filtration : Filters During Back
Wash |
Filtration Stops : During backwash filtration
stops |
| Back Wash Cycle Time |
Very Short : 1.0 to 1.2 Minute |
Long : 15 to 20 Minute |
| Waste Water Per Day |
Minimum : 1.0 to 1.5 % of the rated service
flow rate |
Very High : 25 to 32 % of the rated flow rate |
| Filtration Quality |
Consistent: Consistent bet. Two backwash cycle |
Inconsistent : Over the period of time quality
Improves |
| Foot Print (e.g. 500 m³/hr) |
Very Small : 5.0 m ² |
Very Large : 20.0 m ² |
Operation Cost
|
Very Low : As no man power required & very lo back wash
water to waste |
Very High : Man power required for operation &
very high quantity of back wash waste water |
Back wash Waste Water
(e.g. 500 m3/hr flow rate) |
Very Low : 7,500
liters/day (approx.) |
Very High : 1,60,000 liters/day
(approx.) |