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It represents the total volume of water that can be processed by the filter before its performance begins to decline significantly.	Assuming a backwash rate of 11 gallons per square foot per minute galft2min is recommended, and an 8 minute backwash is required, calculate the amount of water, in gallons, required for each backwash.
Calculation ufrv is calculated using the following formula ufrv filter run length hours x filtration rate m3hm2 filter run length this is the time between backwashes, indicating how long the filter can operate effectively before needing cleaning.	Google flights is best for speed, accuracy, and major airlines, while skyscanner is better for budget carriers and international variety.
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