{"product_id":"unicel-c-7375","title":"Unicel C-7375 Replacement Filter for Caldera Spas 72828 | 75 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7375 is a pleated polyester spa cartridge filter element providing 75.0 sq ft of filtration area, engineered as a direct OEM replacement for Caldera Spas filter model 72828. The element features Reemay nonwoven polyester media with nominal 15-micron filtration efficiency, supported by injection-molded ABS end caps in a closed-bottom, open-top SAE-thread configuration consistent with Caldera's threaded standpipe manifold design. Internal core construction is rated for the pressure range of residential spa circulation systems (typical 5–15 PSI operating). Maximum continuous service temperature: 104°F, with intermittent excursions to 120°F acceptable per Unicel testing protocol. The 75 sq ft media pack delivers substantial dirt-holding capacity suited to high-bather-load spa applications and extended service intervals between chemical cleanings.\u003c\/p\u003e\n\u003cp\u003eService interval recommendation: rinse with fresh water every 2–4 weeks under normal residential spa use; chemical soak with dilute TSP or commercial enzyme\/degreaser every 4–6 weeks to remove oils, lotions, and surfactant residue that resist water rinsing. Replace at ≤ 12-month intervals under typical use, or earlier when ΔP exceeds 5 PSI above clean-filter baseline, when visual inspection reveals pleat collapse or fabric tears, or when chemical cleaning no longer restores flow. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, followed by thorough freshwater rinse). Verify ozone compatibility before deployment in ozone-primary sanitization systems. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution channels.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eYour order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":42315912806446,"sku":"UNFC7375","price":57.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNFC7375_90de449d-b304-4236-8e1f-c1de02ecef65.jpg?v=1777663280","url":"https:\/\/poolzilla.com\/products\/unicel-c-7375","provider":"Poolzilla","version":"1.0","type":"link"}