Sturdy and Durable: In addition to harmful end caps and straps, it also has anti-crack and anti-corrosion functions. The matched filter material extends the service life, has a high dust storage capacity and effectively removes rubbish and strange smells.More cartridge pleats mean improved filter capacity. Dimension: With an outer diameter of 5inch, inner diameter of 2-1/8inch and a height of 13-5/16inch, definitely compatible with your filter perfectly. It's a great alternative filter for hot tubs and spas.Our spa filter can deliver lower pressure and higher flow rates, causes less pump wear, and also uses less energy than other filter cartridges, so it ensures a longer life of the product. : Compatible with PRB25-IN, PDC25-AFS, Unicel C-4326, Filbur -2375, 413-106, R173429, 3005845, 17-2327, 100586, 33521, 25392, 817-2500 and more. Powerful Filtration: Made of advanced trilobal fabric, effectively collecting a large amount of debris or other contaminants, getting the water clean and running smoother.The filter is like a new one after cleaning. It is recommended that the cartridges be cleaned every 2 weeks to keep your spa performing. Long Lifespan: Thickened filter cloth, heavy duty anti-chlorine and breakage end caps, reinforced center core and durable washable pleated fabric make the whole filter elements longer lifespan and can be reused, saving money.This spa filter can effectively remove hair, leaves, sand, stones, dust, impurities, sediments, etc, with high efficiency and powerful filtering. Colour:White Material:plastic Size:125 x 338mm Package Contents: 2 x Spa Filter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.