{"product_id":"cartridge-filter-50-sqft","title":"Unicel Cartridge Filter, 50 Sq Ft","description":"\u003cp\u003eThe Unicel 4CH-949 is a 50 square foot replacement filter cartridge measuring 4-15\/16 inch across the outside and 13-1\/2 inch in length. It is listed for filters manufactured by Rising Dragon.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGetting the size right\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eCartridges are ordered by measurement, not by the name on the filter housing. Outside diameter, length and rated square footage are the three numbers to check against the cartridge you are taking out. A cartridge that is close but not exact will let water bypass the media, and unfiltered water going back to the pool defeats the point.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat the rating buys you\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFifty square feet is the pleated surface area available to catch dirt. The larger the area, the more the cartridge holds before pressure climbs and it needs cleaning, so a correctly sized cartridge runs longer between service stops.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGetting the most from it\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eClean on pressure rather than on the calendar, rinse the pleats out rather than blasting them, and keep a second cartridge on hand so one can dry completely while the other is in service. Replace the cartridge when the pleats stop coming clean or the media goes limp.\u003c\/p\u003e","brand":"Unicel Filter Cartridges","offers":[{"title":"Default Title","offer_id":48628806385876,"sku":"UNI-051-0949","price":40.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_fe07a285-6b8d-4991-b378-4fa9c4957b2b.jpg?v=1788751893","url":"https:\/\/www.activepoolsupply.com\/products\/cartridge-filter-50-sqft","provider":"Active Pool Supply","version":"1.0","type":"link"}