{"product_id":"grid-de-11x-18","title":"SuperPro DE Filter Grid, 11 in x 18 in","description":"\u003cp\u003eThe SuperPro FC-9825 is a replacement DE filter grid measuring 11 inches by 18 inches. It is sold as a single element so you can change just the one that has failed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow a DE grid works\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe grid itself does not do the filtering. Diatomaceous earth is drawn out of the skimmer and coats the fabric, and it is that thin cake of powder that catches the fine dirt. The grid is the frame and the cloth that hold the cake in place while water passes through.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen to replace one\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDE returning to the pool after you charge the filter is the classic sign. So is a filter that will not hold pressure or that keeps needing more powder. Open the tank, lift the grid assembly out and look at each element for tears, split seams and crushed frames. Measure whatever you pull out, because a grid set usually contains more than one size.\u003c\/p\u003e","brand":"Filbur","offers":[{"title":"Default Title","offer_id":48634169655508,"sku":"SPG-051-0205","price":36.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/FC-9825_grid.jpg?v=1788826150","url":"https:\/\/www.activepoolsupply.com\/products\/grid-de-11x-18","provider":"Active Pool Supply","version":"1.0","type":"link"}