What type of filter is positioned before the pump in a swimming pool system?

In a swimming pool system, the filter typically positioned before the pump is a vacuum filter. This type of filter is designed to catch debris and particles from the pool water before it enters the pump, ensuring that the pump operates efficiently and reducing the risk of damage from larger debris. The vacuum filter works by drawing water in from the pool, filtering out unwanted materials, and keeping the pump and subsequent filtration systems clean and functioning effectively.

The correct positioning of this filter prior to the pump helps in maintaining both the longevity of the pump and the overall cleanliness of the pool water.