Easy to use reusable foam filters that can be used several times, helping you save money while you enjoy your spa. High quality sponge material that is practical and durable for repeated use. The filter delivers effective filtration when your tub has proper chemical levels maintained. Important note on chlorine: water should not be over-chlorinated, as the foam can decompose. Remove the filter when using a chlorine shock treatment. For non-chlorine or other shock treatments, removal is not necessary. Key attributes - Function: filtration and debris capture to support clean spa water - Material: high quality sponge foam for durability and practical use - Performance: reusable across multiple uses with proper chemical balance - Care guidance: follow chlorine shock removal requirement to preserve filter integrity Use scenarios 1) Routine spa maintenance with balanced chemicals - Insert the filter to help keep water clean between cleanings and filter debris during regular spa use. 2) Non-chlorine shock treatment - Leave the filter in place during non-chlorine shock treatments to maintain filtration without removing the filter. 3) Chlorine shock treatment - Remove the filter before applying chlorine shock. Reinsert the filter after the treatment is complete to restore filtration.