What action should be taken to manage gravel displacement or sand boil formation?

Managing gravel displacement or sand boil formation in filtration systems requires careful control of the backwash process. Slowing the rate of backwash valve operation is effective because it allows for a gentler and more controlled flow of water through the filter media.

When backwashing too quickly, the velocity of the water can lift not only the particles that need to be cleaned but also the heavier media, potentially leading to displacement or the formation of boils – areas where water is bubbling up through the sand and gravel, causing them to mix. By reducing the speed, the operator minimizes the chances of disturbing the media and allows for better cleaning of the filter without risking media loss.

This approach ensures that the filtration system remains effective and that the integrity of the filter media is maintained, allowing for optimal water treatment performance.