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2 Pack Spa In-Filter Mineral Sticks Parts Cartridge Sticks For Hot Tub Spa Swimming Pool Fish Pond Filter Cartridge [Upgraded Spa] Our mineral sticks add trace minerals to the water and decrease impurities within the water, thus holding the water clear and making you as comfortable as if you've been in a pure natural spa. [Safe Materials] Our well-made mineral sticks are made from premium ABS plastic, solid and odorless. The minerals contained inside will not trigger any damage to the human body so please relaxation guaranteed to use. [Easy to Use] Just put our mineral sticks straight into the spa filters or skimmers and permit them to do their work. [Wide Application] Make sure your filter is longer than 7inch and the diameter of the filter out gap is larger than 1 to slot our products. They are right for spas and sizzling tubs up to 500 gallons / 2000L and pools to preserve the algae out. [Long Lasting] Our two cost-effective cartridge sticks can last for as a lot as four months and are practically maintenance-free. So they are honestly the proper choice for you to effectively maintain water advantageous at low cost. Colour: yellow + blue Material: ABS + minerals Size: connected size: 3 Package Contents: 2 * Water Filter Only the above equipment content, various item will not be included. Note: Light reflection and diversified displays may cause the colour of the thing in the photograph a little diversified from the genuine thing. The measurement allowed error is +/- 1-3cm.