Certified Pool Operator Practice Test

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What is the primary purpose of using precoat in DE filters?

  1. prevent algae growth

  2. increase water clarity

  3. maximize filter efficiency

  4. neutralize pH levels

The correct answer is: prevent algae growth

Precoat is a diatomaceous earth (DE) filter aid that coats the filter grids and helps trap even the smallest particles in the water. This is essential for preventing algae growth in the filter, as well as improving water clarity. While options B and C may be benefits of using precoat, they are not the primary purpose. Option D, neutralizing pH levels, is not related to the purpose of precoat in DE filters.

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