Certified Pool Operator Practice Test

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The flow requirement of a rapid rate sand filter during backwashing is __________ gpm per square foot.

  1. 10-12

  2. 12-15

  3. 14-16

  4. 15-18

The correct answer is: 10-12

The flow requirement for a rapid rate sand filter during backwashing is typically 10-12 gallons per minute per square foot. Option B, 12-15 gpm per square foot, is a slightly higher flow rate and may result in excess water and debris being flushed out, causing inefficiency in the backwashing process. Option C, 14-16 gpm per square foot, and option D, 15-18 gpm per square foot, both have even higher flow rates, which can potentially damage the sand filter and decrease its lifespan. It is important to follow the recommended flow rate of 10-12 gpm per square foot to ensure proper backwashing and maintenance of the sand filter.

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