WATER PURIFICATIONMineral sticks add trace minerals to the water and reduce impurities in the water, multi-layer filtration makes water more healthy, thus keeping the water clear and making you as comfortable as if you were in a pure natural spa. SAFE MATERIALSThese well-made mineral sticks are made of ABS plastic, strong and odorless. The minerals contained inside will not cause any harm to the human body, safe and environment friendly, giving you a healthier life. EASY TO USEJust put mineral sticks directly into the spa filters or skimmers and let them do their work. The products come with a manual that provides you with detailed instructions and precautions for use. WIDE APPLICATIONSThe spa accessories mineral stick suitable for hot tub for spa up to 500 gallons/1900L, suit for the most tub, outdoor swimming pools, hot spring pools, baths, spa pools, plunge pools and many more. LONG LASTINGCan provide up to 4 months of service for your hot tub filter, and the maintenance cost is extremely low, helpful to save your time and cost, they are the right choice for you to effectively maintain water quality at low cost. Description: Includes 4pcs mineral sticks, are made of healthy and durable ABS materials, add trace minerals to the water and reduce impurities in the water, multi-layer filtration. Put mineral sticks directly into the spa filters or skimmers, keep fresh and clean water for a long time, bring you a natural and healthy spa. Specification: Material: ABS+Minerals Color: Yellow Size(DxL): About 3.2x41cm/1.26x16.14inch Quantity: 4pcs/pack Package includes: 4pcs x Filter Cartridge Sticks Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement.