FD2135 Filter Cartridge — efficiency replacement cartridge for inflatable pools and hot tubs Key benefits Keeps water clean and clear: Captures dirt, hair and debris so pool and hot tub water stays fresher between chemical treatments. Saves time on maintenance: Simple, tool replacement reduces downtime and hassle when servicing filters. Longlasting performance: quality PET media resists wear and maintains filtration efficiency under frequent use. Reliable fit: Designed to match common inflatable pool and hot tub filter housings for a secure, leak installation. What it does Function: Removes suspended particles and debris from circulation water to improve clarity and protect pump components. Material: Multilayer PET filtration media for effective dirt capture and durability. Performance: Consistent filtration efficiency through repeated use thanks to sturdy PET construction. Compatibility and size Model: FD2135 filter cartridge. Dimensions: 10.8 cm external diameter, 4.5 cm internal hole diameter. Fit: Designed for most standard inflatable swimming pools and hot tubs that accept cartridges with these dimensions. Easy replacement No special tools required: Pushfit design allows quick removal of the old cartridge and installation of the FD2135. Basic steps: Turn off pump, remove housing cap, pull out old cartridge, insert FD2135, reassemble and restart pump. Maintenance tip: Rinse the cartridge with a hose to extend service life and when visibly worn or flow decreases. Practical use scenarios Weekly pool upkeep: the cartridge during routine maintenance to reduce cloudiness and maintain chemical effectiveness. After heavy use or a pool party: Install a fresh FD2135 to clear increased debris and restore water clarity quickly. Hot tub maintenance between users: Swap the cartridge to help maintain comfortable, debris water for multiple users. Why choose the FD2135 Designed specifically to address common pool and hot tub filtration needs with a straightforward, durable solution. Accurate sizing and robust PET construction deliver dependable performance without additional tools or complex procedures. Specifications Model: FD2135 Material: quality PET filter media External diameter: 10.8 cm Internal hole diameter: 4.5 cm Note: cartridges as needed based on usage and water conditions. Follow your pool or hot tub equipment manufacturer's guidance for results.