{"product_id":"vontron-reverse-osmosis-membrane-ulp31-4040","title":"Vontron Reverse Osmosis Membrane ULP31-4040","description":"\u003ch1 data-start=\"478\" data-end=\"1129\"\u003eVontron ULP31‑4040 RO Membrane – Ultra‑Low Pressure 4″×40″\u003c\/h1\u003e \u003cp data-start=\"478\" data-end=\"1129\"\u003eThe Vontron ULP31‑4040 RO Membrane is an ultra-low-pressure reverse osmosis element that delivers high performance in a compact format. With this \u003cstrong data-start=\"624\" data-end=\"647\"\u003eVontron RO Membrane\u003c\/strong\u003e, you get around 1,900 GPD (~7.2 m³\/day) under ideal conditions, along with ~99% rejection, making it a strong choice for surface water, municipal, and low‑TDS applications. It operates at considerably lower pressure than standard membranes — thereby reducing infrastructure and energy costs. The 4″ × 40″ “4040” size ensures compatibility with common vessels and easier integration into existing RO systems.\u003c\/p\u003e \u003ch3 data-start=\"1136\" data-end=\"1191\"\u003eKey Features of the Vontron ULP31‑4040 RO Membrane\u003c\/h3\u003e \u003cul\u003e \u003cli data-start=\"1194\" data-end=\"1330\"\u003eUltra‑low-pressure design: works at approximately two‑thirds the pressure of standard membranes.\u003c\/li\u003e \u003cli data-start=\"1333\" data-end=\"1446\"\u003eHighly stable rejection (~99.4%) with a minimum of ~99.0% under test conditions.\u003c\/li\u003e \u003cli data-start=\"1449\" data-end=\"1548\"\u003eRated average permeate ~1,900 GPD under testing conditions.\u003c\/li\u003e \u003cli data-start=\"1551\" data-end=\"1673\"\u003eSuitable for feedwater TDS up to ~2,000 ppm NaCl (municipal, surface, or borehole).\u003c\/li\u003e \u003cli data-start=\"1676\" data-end=\"1736\"\u003eCompact 4″ diameter × 40″ length fits standard RO vessels.\u003c\/li\u003e \u003cli data-start=\"1739\" data-end=\"1880\"\u003eRobust operating limits: Max pressure ~600 psi (4.14 MPa), max feed temperature ~45 °C, feed SDI ≤ 5.\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 data-start=\"1887\" data-end=\"1916\"\u003eTechnical Specifications\u003c\/h3\u003e \u003cdiv class=\"_tableContainer_1rjym_1\"\u003e \u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\"\u003e \u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1918\" data-end=\"3566\"\u003e \u003cthead data-start=\"1918\" data-end=\"1996\"\u003e \u003ctr data-start=\"1918\" data-end=\"1996\"\u003e \u003cth data-start=\"1918\" data-end=\"1950\" data-col-size=\"sm\"\u003eParameter\u003c\/th\u003e \u003cth data-start=\"1950\" data-end=\"1996\" data-col-size=\"md\"\u003eValue\u003c\/th\u003e \u003c\/tr\u003e \u003c\/thead\u003e \u003ctbody data-start=\"2075\" data-end=\"3566\"\u003e \u003ctr data-start=\"2075\" data-end=\"2153\"\u003e \u003ctd data-start=\"2075\" data-end=\"2106\" data-col-size=\"sm\"\u003eModel\u003c\/td\u003e \u003ctd data-start=\"2106\" data-end=\"2153\" data-col-size=\"md\"\u003eULP31‑4040\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"2154\" data-end=\"2270\"\u003e \u003ctd data-start=\"2154\" data-end=\"2185\" data-col-size=\"sm\"\u003eActive Membrane Area\u003c\/td\u003e \u003ctd data-start=\"2185\" data-end=\"2270\" data-col-size=\"md\"\u003e≈ 90 ft² (≈8.4 m²)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"2271\" data-end=\"2386\"\u003e \u003ctd data-start=\"2271\" data-end=\"2302\" data-col-size=\"sm\"\u003eRated Permeate Flow\u003c\/td\u003e \u003ctd data-start=\"2302\" data-end=\"2386\" data-col-size=\"md\"\u003e~1,900 GPD (~7.2 m³\/day)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"2387\" data-end=\"2504\"\u003e \u003ctd data-start=\"2387\" data-end=\"2418\" data-col-size=\"sm\"\u003eStable Rejection Rate\u003c\/td\u003e \u003ctd data-start=\"2418\" data-end=\"2504\" data-col-size=\"md\"\u003e≈ 99.4%\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"2505\" data-end=\"2622\"\u003e \u003ctd data-start=\"2505\" data-end=\"2536\" data-col-size=\"sm\"\u003eMinimum Rejection Rate\u003c\/td\u003e \u003ctd data-start=\"2536\" data-end=\"2622\" data-col-size=\"md\"\u003e≈ 99.0%\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"2623\" data-end=\"2740\"\u003e \u003ctd data-start=\"2623\" data-end=\"2654\" data-col-size=\"sm\"\u003eMaximum Operating Pressure\u003c\/td\u003e \u003ctd data-start=\"2654\" data-end=\"2740\" data-col-size=\"md\"\u003e~600 psi (~4.14 MPa)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"2741\" data-end=\"2858\"\u003e \u003ctd data-start=\"2741\" data-end=\"2772\" data-col-size=\"sm\"\u003eMaximum Feed Temperature\u003c\/td\u003e \u003ctd data-start=\"2772\" data-end=\"2858\" data-col-size=\"md\"\u003e45 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"2859\" data-end=\"2976\"\u003e \u003ctd data-start=\"2859\" data-end=\"2890\" data-col-size=\"sm\"\u003eMaximum Feed Flow\u003c\/td\u003e \u003ctd data-start=\"2890\" data-end=\"2976\" data-col-size=\"md\"\u003e16 gpm (~3.6 m³\/h)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"2977\" data-end=\"3094\"\u003e \u003ctd data-start=\"2977\" data-end=\"3008\" data-col-size=\"sm\"\u003eSDI (Silt Density Index)\u003c\/td\u003e \u003ctd data-start=\"3008\" data-end=\"3094\" data-col-size=\"md\"\u003e≤ 5\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"3095\" data-end=\"3212\"\u003e \u003ctd data-start=\"3095\" data-end=\"3126\" data-col-size=\"sm\"\u003eFree Chlorine in Feed\u003c\/td\u003e \u003ctd data-start=\"3126\" data-end=\"3212\" data-col-size=\"md\"\u003e\u0026lt; 0.1 ppm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"3213\" data-end=\"3330\"\u003e \u003ctd data-start=\"3213\" data-end=\"3244\" data-col-size=\"sm\"\u003epH Range (Continuous)\u003c\/td\u003e \u003ctd data-start=\"3244\" data-end=\"3330\" data-col-size=\"md\"\u003e3–10\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"3331\" data-end=\"3448\"\u003e \u003ctd data-start=\"3331\" data-end=\"3362\" data-col-size=\"sm\"\u003epH Range (Cleaning)\u003c\/td\u003e \u003ctd data-start=\"3362\" data-end=\"3448\" data-col-size=\"md\"\u003e2–12\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-start=\"3449\" data-end=\"3566\"\u003e \u003ctd data-start=\"3449\" data-end=\"3480\" data-col-size=\"sm\"\u003ePhysical Size\u003c\/td\u003e \u003ctd data-start=\"3480\" data-end=\"3566\" data-col-size=\"md\"\u003eLength ~1016 mm, OD ~99.7 mm (3.9″)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003c\/div\u003e \u003ch3 data-start=\"3573\" data-end=\"3624\"\u003eWhy Choose the Vontron ULP31‑4040 RO Membrane?\u003c\/h3\u003e \u003cp data-start=\"3625\" data-end=\"4061\"\u003eOpting for the Vontron ULP31‑4040 RO Membrane means choosing a high‑efficiency membrane that delivers \u003cstrong data-start=\"3727\" data-end=\"3753\"\u003ereliable water quality\u003c\/strong\u003e with \u003cstrong data-start=\"3759\" data-end=\"3801\"\u003ereduced energy and infrastructure cost\u003c\/strong\u003e. It is ideal for customers requiring large throughput without high-pressure systems. Moreover, its compatibility with existing 4″×40″ housings makes retrofit simple, and its strong performance specs ensure long-term value in municipal or low‑TDS applications.\u003c\/p\u003e \u003ch3 data-start=\"4068\" data-end=\"4104\"\u003eInstallation \u0026amp; Maintenance Tips\u003c\/h3\u003e \u003col\u003e \u003cli data-start=\"4108\" data-end=\"4209\"\u003eEnsure pre‑treatment: feedwater must meet SDI ≤ 5, free chlorine \u0026lt; 0.1 ppm, and temperature ≤ 45 °C.\u003c\/li\u003e \u003cli data-start=\"4213\" data-end=\"4404\"\u003eOn first use, flush the new membrane: 15‑25 minutes at low pressure, followed by 60‑90 minutes at full pressure — discard the first hour of permeate.\u003c\/li\u003e \u003cli data-start=\"4408\" data-end=\"4544\"\u003eMonitor key indicators: gradually check permeate flow, conductivity, and differential pressure; any drop may signal fouling or scaling.\u003c\/li\u003e \u003cli data-start=\"4548\" data-end=\"4679\"\u003eFollow chemical cleaning protocols as specified by the manufacturer. Avoid excessive chlorine exposure and maintain pH within limits.\u003c\/li\u003e \u003cli data-start=\"4683\" data-end=\"4849\"\u003eFor storage or standby, keep the membrane wet or in a protective solution (e.g., 1% sodium bisulfite) to prevent microbial growth.\u003c\/li\u003e \u003c\/ol\u003e","brand":"Vontron","offers":[{"title":"Default","offer_id":45115709194309,"sku":"ULP31-4040","price":2624.99,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/8627\/7445\/files\/vontro-ulp21-4040-reverse-osmosis-membrane_7c429946-a2c2-4ab4-a419-88028142c53a.jpg?v=1780903313","url":"https:\/\/www.monstermechanical.co.za\/products\/vontron-reverse-osmosis-membrane-ulp31-4040","provider":"Monster Mechanical","version":"1.0","type":"link"}