{"product_id":"ulp21-4021-ultra-low-pressure-ro-membrane-4-21-950-gpd","title":"ULP21-4021 Ultra-Low-Pressure RO Membrane – 4″ × 21″, 950 GPD","description":"\u003cp\u003eThe ULP21-4021 Reverse Osmosis Membrane is a compact, ultra-low-pressure membrane element designed for efficient dissolved solids reduction in commercial and light-industrial water treatment systems. Its nominal 4-inch × 21-inch configuration supports installation in compatible 4021 pressure vessels and compact RO equipment.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eUnder specified test conditions, the ULP21-4021 provides a nominal permeate flow of 950 gallons per day (approximately 3.6 cubic meters per day) with a stable salt-rejection rate of 99%. Its ultra-low-pressure design helps deliver effective permeate production at lower pressure than many conventional low-pressure membrane elements.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe spiral-wound membrane element provides approximately 36 square feet of active membrane area. Its shortened 21-inch length allows substantial membrane capacity to be integrated into compact commercial systems where a full-length 4040 element may not be suitable.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe membrane is intended for appropriately pretreated, low-salinity feedwater such as qualifying municipal water, groundwater, and surface water. Proper pretreatment is essential for controlling sediment, hardness, scaling, iron, organic fouling, and oxidizing chemicals that could reduce membrane performance or shorten its operating life.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specification\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eULP21-4021\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eMembrane Type\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eReverse Osmosis (RO)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eTechnology\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eThin Film Composite (TFC)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eElement Size\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e4.0″ x 21″ (4021)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eNominal Flow Rate\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e~1,000 GPD (typical)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eSalt Rejection\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e 99% (typical)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eOperating Pressure\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eUltra-Low Pressure\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eMax Operating Temperature\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e113°F (45°C)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eMax Feed TDS\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e2,000 ppm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eOperating pH Range\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e2 – 11\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eCleaning pH Range\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e1 – 12\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eChlorine Tolerance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u0026lt; 0.1 ppm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eCommercial RO, Compact RO Systems\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTesting Conditions\u003c\/h3\u003e\n\u003cp\u003eTesting Pressure: 150 psi (1.03MPa)\u003c\/p\u003e\n\u003cp\u003eTesting Solution Temperature: 25 ℃\u003c\/p\u003e\n\u003cp\u003eConcentration of Testing Solution (NaCl): 1500ppm\u003c\/p\u003e\n\u003cp\u003epH value of Testing Solution: 7.5\u003c\/p\u003e\n\u003cp\u003eRecovery Rate of Single Element: 8%\u003c\/p\u003e\n\u003ch3\u003eOperation Limits \u0026amp; Conditions\u003c\/h3\u003e\n\u003cp\u003eMax. Working Pressure: 600psi\u003cspan\u003e（\u003c\/span\u003e4.14MPa\u003cspan\u003e)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eMax. Volume of Feed Water: 16gpm\u003cspan\u003e（\u003c\/span\u003e3.6 m3\/h\u003cspan\u003e）\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eMax. Temperature of Feed Water: 45\u003cspan\u003e℃\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e Max. Feed water SDI15: 5\u003c\/p\u003e\n\u003cp\u003epH Range of Feed Water during Continuous Operation: 3\u003cspan\u003e～\u003c\/span\u003e10\u003c\/p\u003e\n\u003cp\u003epH Range of Feed Water during Chemical Cleaning: 2\u003cspan\u003e～\u003c\/span\u003e12\u003c\/p\u003e\n\u003cp\u003eResidual Chlorine Concentration of Feed Water : \u003cspan\u003e＜\u003c\/span\u003e0.1ppm\u003c\/p\u003e\n\u003cp\u003eMax. Pressure Drop of Single Membrane Element: 15psi\u003cspan\u003e（\u003c\/span\u003e0.1MPa\u003cspan\u003e）\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eMax. Pressure Drop of Single Pressure Vessel with Six RO Membranes: 50psi\u003cspan\u003e（\u003c\/span\u003e0.34MPa\u003cspan\u003e）\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cp\u003e◎ Drinking water production, such as: packaged water, direct drinking water, food processing water, etc.\u003c\/p\u003e\n\u003cp\u003e◎ Purified water production, such as: pharmaceutical water, medical water, electronics water, etc.\u003c\/p\u003e\n\u003ch3\u003eShipping Information\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eOptimal Purity Solutions\u003c\/strong\u003e is committed to fast, reliable, and professional fulfillment for our authorized dealer network.\u003c\/p\u003e\n\u003cp\u003eFulfillment \u0026amp; Processing\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOrder Processing:\u003c\/strong\u003e Most in-stock orders ship within \u003cstrong\u003e1–2 business days\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCustom\/OEM Builds:\u003c\/strong\u003e Lead times vary by configuration; your sales representative will confirm timelines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShipping Coverage\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDomestic:\u003c\/strong\u003e Nationwide shipping throughout the United States\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInternational:\u003c\/strong\u003e Available for qualified distributors (terms and transit times vary)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCarriers \u0026amp; Methods\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eShipments are sent via \u003cstrong\u003etrusted national freight and parcel carriers\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLTL\/FTL freight\u003c\/strong\u003e available for pallets and bulk orders\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eExpedited shipping options available upon request\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePackaging \u0026amp; Handling\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eProducts are \u003cstrong\u003eprofessionally packaged\u003c\/strong\u003e to protect against damage in transit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePalletized and freight shipments are \u003cstrong\u003esecured and labeled\u003c\/strong\u003e to industry standards\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTracking \u0026amp; Support\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eTracking information is provided once your order ships\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOur logistics team is available to assist with \u003cstrong\u003erouting, delivery coordination, and special requirements\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eImportant Notes\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eShipping costs are calculated based on \u003cstrong\u003eweight, dimensions, destination, and service level\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDamages or discrepancies\u003c\/strong\u003e must be reported within \u003cstrong\u003e48 hours of delivery\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProducts are sold \u003cstrong\u003eexclusively through authorized water treatment dealers and partners\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optimal Purity Solutions","offers":[{"title":"Default Title","offer_id":67819418648619,"sku":"ULP21-4021","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0803\/9497\/7323\/files\/886b7f_ad9b86fb440c47f6a2d9cd59f7576f4fmv2.png?v=1791813281","url":"https:\/\/shop.optimalpuritysolutions.com\/products\/ulp21-4021-ultra-low-pressure-ro-membrane-4-21-950-gpd","provider":"Optimal Purity Solutions","version":"1.0","type":"link"}