{"product_id":"pentair-155321-43-water-softener-cartridge-filter-20in","title":"Pentair 155321-43 Water Softener Cartridge Filter 20in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PENTAIR 155321-43 is a water softener cartridge filter designed for residential and light commercial plumbing filtration systems. Measuring 20 inches in length with a 4.5-inch outside diameter, this cartridge is constructed from FDA-grade standard softener resin, making it suitable for potable water applications. It supports a maximum flow rate of 2.00 GPM and is rated for water temperatures up to 100 degrees F. Licensed plumbers and water treatment technicians install this cartridge in whole-house softener housings as part of ion exchange or pre-filtration setups. The FDA-grade resin material confirms it meets food-grade safety standards for drinking water contact.\u003c\/p\u003e\n\u003cp\u003eThis cartridge filter is used in point-of-entry water treatment systems where softening or resin-based filtration is required. Typical applications include residential whole-house installations and light commercial settings that rely on a standard large-format filter housing. The 20-inch length fits standard big-blue or equivalent cartridge housings that accommodate 4.5-inch OD cartridges. It is sized for systems requiring moderate flow capacity at lower operating temperatures, making it a practical fit for softener pre-filter or standalone resin filtration stages in plumbing systems.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eFDA-grade standard softener resin construction for potable water compliance\u003c\/li\u003e\n  \u003cli\u003e20-inch cartridge length fits standard large-format filter housings\u003c\/li\u003e\n  \u003cli\u003e4.5-inch outside diameter for compatibility with big-blue style housings\u003c\/li\u003e\n  \u003cli\u003eMaximum flow rate of 2.00 GPM for controlled filtration performance\u003c\/li\u003e\n  \u003cli\u003eRated up to 100 degrees F maximum working temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement cartridge for standard large-format plumbing filter housings that accept 4.5-inch OD, 20-inch cartridges in residential and light commercial water treatment systems.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed plumber or qualified water treatment technician. Shut off the water supply and relieve system pressure before opening the filter housing. Follow local plumbing codes, including applicable IPC requirements, when integrating into potable water systems. Do not exceed the rated maximum flow rate or temperature during operation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Type\u003c\/strong\u003e: Water Softener Cartridge\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 20 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 4.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Standard Softener Resin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: FDA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Flow Rate\u003c\/strong\u003e: 2.00 GPM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Working Temperature\u003c\/strong\u003e: 100 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 8.334 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: PENTAIR\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 155321-43\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PENTAIR","offers":[{"title":"Default Title","offer_id":51544572723506,"sku":"155321-43","price":134.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6d80dd947c4f91d665eaf9cfc541264d.jpg?v=1785930343","url":"https:\/\/voomisupply.com\/products\/pentair-155321-43-water-softener-cartridge-filter-20in","provider":"Voomi Supply","version":"1.0","type":"link"}