{"product_id":"ulp31-4040-ultra-low-pressure-ro-membrane-4-40-2-000-gpd","title":"ULP31-4040 Ultra-Low-Pressure RO Membrane – 4″ × 40″, 2,000 GPD","description":"\u003cp\u003eThe ULP31-4040 Reverse Osmosis Membrane is a high-rejection, ultra-low-pressure membrane element designed for efficient dissolved-solids reduction in commercial and industrial water-treatment systems. Its standard 4-inch × 40-inch configuration supports installation in compatible 4040 pressure vessels and multi-element RO equipment.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eUnder specified test conditions, the current ULP31-4040 configuration provides a nominal permeate flow of 2,000 gallons per day (approximately 7.6 cubic meters per day) with a stable salt-rejection rate of 99.6%. This performance makes the membrane suitable for systems where higher permeate quality is prioritized alongside energy-efficient, ultra-low-pressure operation.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe spiral-wound element provides approximately 100 square feet of active membrane area and uses a 28-mil feed spacer. Its combination of high salt rejection, commercial permeate production and standard 4040 dimensions supports integration into new equipment and compatible membrane-replacement applications.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe ULP31-4040 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, scale, iron, organic fouling and oxidizing chemicals that could reduce performance or shorten membrane life.\u003c\/p\u003e\n\u003cdiv\u003e \u003c\/div\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\u003eULP31-4040\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\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\u003eSize\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e4″ x 40″\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 Salt Rejection\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e 99.5%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eTypical Permeate Flow\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e~3,100 GPD (11.7 m³\/day)\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\u003eMaximum Operating Pressure\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e600 psi (41 bar)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eMaximum Operating Temperature\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e45°C (113°F)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eMaximum Feed SDI\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e≤\u003c\/span\u003e\u003cspan\u003e 5\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eFeed Water pH (Continuous)\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\u003eFeed Water pH (Cleaning)\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\u003eCompatibility\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eStandard 4″ RO pressure vessels\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: 15%\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":67819418877995,"sku":"ULP31-4040","price":149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0803\/9497\/7323\/files\/886b7f_3924dce55d724585b8cb4ffbc14c0878mv2.png?v=1791813285","url":"https:\/\/shop.optimalpuritysolutions.com\/products\/ulp31-4040-ultra-low-pressure-ro-membrane-4-40-2-000-gpd","provider":"Optimal Purity Solutions","version":"1.0","type":"link"}