{"product_id":"unicel-c-8300-100-sq-ft-caldera-utopia-spa-filter","title":"Unicel C-8300 | 100 sq ft Caldera Utopia Spa Filter","description":"\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eUnicel C-8300\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100 square foot\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ereplacement cartridge for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCaldera Utopia Cantabria\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003espas built between\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e2009 and 2014\u003c\/strong\u003e, replacing Caldera part number\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e74817\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand the identical Hot Spring part\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e77004\u003c\/strong\u003e. With\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e259 pleats\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eacross an 8\" body standing 16-1\/2\" tall, it is a large, serious cartridge built for a large, serious spa.\u003c\/p\u003e\n\u003cp\u003eBoth ends are\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3-1\/8\" open with a molded gasket\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— a rubber sealing ring formed integrally into each end cap face rather than fitted as a separate part. That gasket is what makes the cartridge work. It compresses against the sealing surfaces in the filter housing when the cartridge is seated, closing off the gap that unfiltered water would otherwise use to slip around the outside of the media. Without an effective seal at both ends, a spa can run cloudy with a brand-new 100 square foot filter installed — because a meaningful share of the water is going around it rather than through it.\u003c\/p\u003e\n\u003cp\u003eCapacity at this level changes the ownership experience in a way that is easy to underestimate. One hundred square feet does not clean\u003cspan\u003e \u003c\/span\u003e\u003cem\u003ebetter\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eon any given pass than a fifty. What it does is spread the same debris load across twice the surface, so the cartridge clogs at roughly half the rate, holds jet pressure steadier for far longer between cleanings, and asks much less of a circulation pump that would otherwise be straining against progressively tighter media. On a large spa with real bather load, that is the difference between filter maintenance as a background chore and filter maintenance as a recurring frustration.\u003c\/p\u003e\n\u003cp\u003eMedia is Unicel's standard\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3 oz Reemay polyester\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— one hundred percent spunbonded polyester over a solid injection-molded core, with chemical-resistant end caps molded to an exact OEM fit, capturing suspended particles down to roughly 20 microns. Made in the USA by Meissner Manufacturing, with more than 45 years behind the Unicel name.\u003c\/p\u003e\n\u003cdiv class=\"lti-pro-tip\"\u003e\n\u003cp\u003e\u003cstrong\u003ePro Tip — read this before ordering if you own a Cantabria.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThere is a second 100 sq ft Utopia cartridge that is almost impossible to tell apart at a glance. It has the\u003cspan\u003e \u003c\/span\u003e\u003cem\u003esame\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003e100 square feet, the\u003cspan\u003e \u003c\/span\u003e\u003cem\u003esame\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003e259 pleats, the\u003cspan\u003e \u003c\/span\u003e\u003cem\u003esame\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003e8\" diameter and 16-1\/2\" length. The only differences are at the ends.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eThis cartridge has 3-1\/8\" openings with a molded gasket and no handle.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe other has larger\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3-5\/8\" openings, a lip seal, and a semi-circular handle\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eacross the top. Cantabria models changed over\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003epartway through 2014\u003c\/strong\u003e, so knowing your model year does not settle it — a 2014 Cantabria could take either one. Pull your old cartridge, measure across the inside of the opening, and look for a handle. Those two checks decide it in about ten seconds.\u003c\/p\u003e\n\u003cdiv class=\"lti-pro-tip\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"lti-pro-tip\"\u003e\n\u003cp\u003e\u003cspan role=\"img\" aria-label=\"®\"\u003eUNICEL®\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":67305585639673,"sku":"mlw1791365001719","price":58.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/5484\/2105\/files\/unicel-c-8300-100-sq-ft-caldera-utopia-spa-filter_1.png?v=1791365030","url":"https:\/\/buyzenvilo.com\/products\/unicel-c-8300-100-sq-ft-caldera-utopia-spa-filter","provider":"Buyzenvilo","version":"1.0","type":"link"}