Certified Pool Operator Practice Test

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What is the process of replacing used diatomaceous earth powder with fresh powder called?

Backwashing
Filtering
Pre-coating
Recycling

The correct answer is: Backwashing

Backwashing is the process of replacing used diatomaceous earth powder with fresh powder. This process involves reversing the water flow in the filter, which allows the used powder to be flushed out and replaced with new powder. This is different from filtering, which is the process of passing water through a filter to remove particles. Pre-coating is the process of adding a layer of diatomaceous earth powder to the filter before starting the filtration process. Recycling is not the correct answer because it does not specifically refer to the process of replacing used diatomaceous earth powder with fresh powder.