Bestway® Filter Cartridge (Twin Pack) contains two replacement filter cartridges for 300/330 gal/hr filter pump systems. If you don't want your filtration pump to affected by grime it's vitally important that you change your filter cartridge at least every two weeks. When the sun is shining there's a strong possibility you'll be using your Bestway® pool for daily swimming and splashing sessions. During these prolonged periods of use, cartridge filters rapidly become clogged with debris. Bestway® Type I filters are easy to fit into a 300/330 gal/hr filter pump and very simple to clean. Regularly rinsing your Bestway® pool filter will prolong its life and is essential for the smooth running of your filter pump system. This will only work for so long before it becomes totally ineffective. In order to maintain clean, clear water it's vital that you replace it. If you're unsure whether the Bestway® Filter Cartridge (Twin Pack) is compatible with your pump you should refer to your filter pump manual. The Type I filter cartridge is one of many in the Bestway® Pool Accessories range. You'll also find filter pumps, cleaning equipment and a variety of other products to enhance your Bestway® Above Ground Pool.