{"product_id":"unicel-7ch-552","title":"Unicel 7CH-552 Filter for Dimension One Spas 752-5015 (2\" MPT) | 52 Sq. Ft.","description":"\u003cdiv class=\"pz-pdp\"\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 7CH-552 is a pleated polyester spa cartridge filter element from Unicel's 7CH specialty commercial series, engineered specifically for Dimension One Spas circulation systems and providing 52.0 sq ft of filtration surface area through a high-pleat-count Reemay nonwoven polyester media pack. Dimensional specifications conform to the Dimension One 2-inch MPT (male pipe thread) mounting interface integrated into the bottom end cap, allowing direct thread-in installation to the spa's filter standpipe without separate manifold hardware. Construction features ABS injection-molded end caps with a closed top and threaded 2\" MPT bottom fitting, mated to a structural core sized for the elevated pressure cycling typical of spa pumps. Nominal filtration efficiency: 15 microns. Maximum rated continuous service temperature: 115°F, with intermittent excursions to 120°F per Unicel testing protocol. The 7CH-552 delivers the highest media area available in the threaded-base Dimension One configuration, extending service cycles in high-bather-load applications.\u003c\/p\u003e\n\u003cp\u003eSpa cartridge service intervals are accelerated relative to pool filtration due to elevated water temperature, lower turnover volume, and concentrated bather-introduced oils and surfactants. Recommended service: fresh-water rinse every 2–4 weeks; chemical soak (dilute TSP solution or commercial enzyme cleaner) every 4–6 weeks to displace lipid and cosmetic residue that resists mechanical rinsing. Replacement trigger: ΔP ≥ 5 PSI above clean-filter operating baseline, or 12-month calendar interval, whichever occurs first; high-use spas (daily occupancy) typically require replacement at 6–9 months. Chemical compatibility: polyester media 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, thorough rinse before reinstallation). Enzyme cleaners compatible without restriction. Inspect the 2\" MPT threads at each service cycle for debris or scale that could compromise se\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":42315918671918,"sku":"UNF7CH552","price":49.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0016\/3453\/3422\/files\/UNF7CH552_9e911918-b2ec-4e39-b6e5-71d92995fe7a.jpg?v=1777663823","url":"https:\/\/poolzilla.com\/products\/unicel-7ch-552","provider":"Poolzilla","version":"1.0","type":"link"}