Description Features: 100% brand new and high quality. Made of premium materials, durable and practical. Easy-to-use reusable foam filter, allowing you to save money and enjoy your hot tub / spa. It is crucial that the water has low chlorine content, as high levels can cause the foam to break down. The filter should always be replaced when used with chlorine (replacement is unnecessary when using non-chlorine or oxygen-based treatments). The filter performs excellently in maintaining bath water levels. Normal discoloration of the filter may occur. Please clean the foam filter using mild soapy water, then rinse thoroughly to prolong its lifespan. We recommend checking the filter daily to remove debris and rinse with running water as needed. If handled correctly, the filter's effectiveness will last for several weeks, and it is washable with warm soapy water. Specifications (about): Application: suitable for certain brands V1, S1 Color: Green Sizes: Outer diameter: 10.4 cm/4.09in Inner diameter: 5.2 cm/2.05in Height: 8 cm/3.15in Packing List: 4 * Pool Sponge Filter (no filter housing) Notes: 1. Due to factors such as screen brightness, the actual color of the product may vary slightly from the images. 2. Please allow for minor manual measurement discrepancies.