How it works: The foldable design increases the filter area, thickens the filter membrane and has a strong pollution absorption capacity. What's in the Box: Filters impurities to reduce residual chlorine, giving you clean, fresh water. This is a necessary part for the home summer inflated swimming pool, replacing the old one. Replacement Swimming Pool Cleaning Filter: The swimming pool filter is a practical choice to replace the old, inflated swimming pool filter which is economical and efficient, giving you almost the same service as the original filter with a lower price. Compact Size, Easy to Carry: The pool filter is compact and lightweight, convenient to use with the inflated pool together, doesn't take up much storage space, perfect for travel or limited storage space. Scope: Upgraded version of FD2089 inflatable swimming pool filter fits all MSPA models, with push and twist bayonet fitting, which is a necessary part for home summer inflated swimming pool, replacing the old one.