Determining the correct quantity of diatomaceous earth (DE) to add to a pool filter after backwashing is essential for maintaining water clarity and proper filtration. Insufficient DE can result in cloudy water and inadequate filtering of contaminants, while excessive DE can clog the filter and reduce its effectiveness. For example, a typical multiport valve filter might require several pounds of DE, which is added through the skimmer while the pump is running and the filter is set to “filter.” The precise amount depends on the filter’s size and the manufacturer’s recommendations.
Maintaining the appropriate DE levels contributes significantly to a clean and healthy swimming environment. Historically, DE has been a favored filtration medium due to its ability to trap microscopic particles that other filter types might miss. This fine powder, composed of fossilized diatoms, creates a porous layer on the filter grids, effectively sieving out debris and leaving the water sparkling. Proper DE addition after backwashing ensures this filtration process continues efficiently, minimizing the need for frequent cleaning and extending the filter’s lifespan.
