{"product_id":"esna1-lf-ld","title":"Hydranautics ESNA1-LF-LD Nanofiltration Membrane Element","description":"\u003cp dir=\"auto\"\u003eThe \u003cstrong\u003eESNA1-LF-LD\u003c\/strong\u003e is a high-performance, \u003cstrong\u003elow-fouling nanofiltration (NF)\u003c\/strong\u003e membrane from Hydranautics (a Nitto Group Company), engineered for ultra-low-pressure operation while delivering excellent softening and selective contaminant removal. As part of the advanced ESNA series, it combines patented \u003cstrong\u003eLow Differential Pressure (LD™)\u003c\/strong\u003e technology with a composite polyamide membrane to achieve superior energy efficiency and long-term reliability in brackish water and surface water treatment applications.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eFeaturing a patented 34 mil feed spacer with biostatic properties, the ESNA1-LF-LD minimizes colloidal fouling, reduces pressure drop, and enhances cleanability — resulting in fewer cleanings, extended membrane life, and lower overall operating costs.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eKey Performance Specifications (8\" x 40\" element):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003ePermeate Flow\u003c\/strong\u003e: 9,500 gpd (36.0 m³\/day)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaCl₂ Rejection\u003c\/strong\u003e: 93% (88% minimum \/ 97% maximum)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpected Calcium Rejection\u003c\/strong\u003e: ~96% in typical 500 ppm well water at 13 gfd flux\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive Membrane Area\u003c\/strong\u003e: 400 ft² (37.2 m²)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeed Spacer\u003c\/strong\u003e: 34 mil (0.864 mm) with biostatic agent\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eFor the 4\" x 40\" (ESNA1-LF-LD-4040) variant:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003ePermeate Flow\u003c\/strong\u003e: 1,900 gpd (7.2 m³\/day)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive Membrane Area\u003c\/strong\u003e: 80 ft² (7.43 m²)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eTested under standard conditions (500 ppm CaCl₂ solution, 75 psi applied pressure, 77°F \/ 25°C, 15% recovery), this membrane provides \u003cstrong\u003e50–90% overall salt rejection\u003c\/strong\u003e while excelling at the removal of divalent ions (hardness), natural organic matter (NOM), TOC, color, pesticides, bacteria, and viruses.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eIdeal Applications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eMunicipal drinking water softening and treatment\u003c\/li\u003e\n\u003cli\u003eSurface water or well water purification\u003c\/li\u003e\n\u003cli\u003eOrganics, PFAS, and pesticide removal\u003c\/li\u003e\n\u003cli\u003eIndustrial process water softening\u003c\/li\u003e\n\u003cli\u003eWastewater reclamation and high-recovery systems\u003c\/li\u003e\n\u003cli\u003eFood \u0026amp; beverage, power generation, and other facilities requiring partial demineralization without full RO-level desalination\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eThe ultra-low operating pressure (often under 100 psi in real-world conditions) translates to significant \u003cstrong\u003eenergy savings\u003c\/strong\u003e, reduced pump requirements, and lower installation\/operating costs compared to traditional brackish water RO membranes. Its low-fouling design makes it particularly effective in challenging feedwaters with higher fouling potential.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eOperating Limits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eMaximum Applied Pressure: 600 psig (4.14 MPa)\u003c\/li\u003e\n\u003cli\u003eMaximum Operating Temperature: 113°F (45°C)\u003c\/li\u003e\n\u003cli\u003epH Range (Continuous): 2–10 (Cleaning: 1–13)\u003c\/li\u003e\n\u003cli\u003eMaximum Chlorine Concentration: \u0026lt;0.1 ppm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eSupplied complete with brine seal, interconnector, and O-rings for straightforward installation in standard pressure vessels.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eWhen your system demands efficient hardness reduction, high organics removal, and minimal energy use without the need for full reverse osmosis, the \u003cstrong\u003eHydranautics ESNA1-LF-LD\u003c\/strong\u003e delivers outstanding performance and value. Backed by Hydranautics’ decades of innovation in membrane technology, it offers stable, long-term operation with reduced maintenance — making it a preferred choice for cost-effective, high-quality water production.\u003c\/p\u003e","brand":"Hydranautics","offers":[{"title":"Default Title","offer_id":46938372571376,"sku":null,"price":672.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9453\/5152\/files\/9BNPY.jpg?v=1776309669","url":"https:\/\/knapprochicago.com\/products\/esna1-lf-ld","provider":"KnappRO","version":"1.0","type":"link"}