General description Reusable and washable filter sponges are an economical solution for maintaining your swimming pool. Unlike traditional paper filters, these foam filters can be cleaned and reused multiple times, significantly reducing your maintenance costs. While the initial investment may be slightly higher, their longevity makes them a cost-effective choice in the long run. Technical specifications Material: Sponge Color: Blue Size (HxW): 10.2 x 9 cm / 4.01 x 3.54 inch (Approx) Center Drilled Hole: 30 mm (Approx) Package Contents: 30 x Filter Sponge Measurement allowed error: +/- 1-3 cm Usage These foam filters are designed to replace Type H paper filters. It is recommended to wash and reattach the foam filters instead of replacing them weekly, as is necessary with paper filters. This will help keep your pool filter clean and efficient.