Super Value Pack: Our 10 pool skimmer socks come with 80 PH test papers.PH test paper can be used to recognize the pH of swimming pool water, to ensure you have the best swimming experience. Filter System Protection: Skimmer Socks catch and remove the smallest debris such as leaves, grass, insects, oil, hair, pollen and other floating debris, before they reach andwon't clog your pool pump and filter, extending the life of your pool filter and filtration system. Easy to Install: The skimmer socks are made of ultra-fine nylon mesh, have good elasticity, can be reused many times, you can easily put them on the basket and take them off, suitable for most types of swimming pool pumps,filter baskets, swimming pool baskets, skimmers, etc. Universal Fit: Our pool filter socks work with in-ground and above-ground pools, hot tubs and spas, etc.And they should replace or clean the socks every 4 to 6 weeks, when they are too dirty to allow water to drain. Note: Please do not use the product while dissolving a chlorine tablet in the basket of your pool skimmer.Otherwise, the skimmer sock will be seriously eroded. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.