General description The Pool Filter Cartridge is compatible with the Bestway 58381 filter pump and designed for Lay-Z-Spa models including Miami, Vegas, Palm Springs, and Paris. This pack includes 2 replacement filters that are easy to use and clean, ensuring optimal performance for your spa. Technical specifications Outer Diameter: 78mm / 3.07'' Inner Diameter: 28mm / 1.1'' Height: 88mm / 3.46'' Usage It is recommended to replace your filter cartridges regularly, typically every 2-3 weeks, to maintain the best performance of your spa. The folding design of the filter provides a larger filtration area, effectively filtering out impurities such as hair, rust, sand, worm eggs, moss, and algae, keeping your spa water clean and fresh.