https://knapprochicago.com/ daily https://knapprochicago.com/products/lg-bw-400-es 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/preview_images/1d987046665f423c97b6e31e16648d04.thumbnail.0000000000.jpg?v=1772147841 LG BW 400 ES – 8" Reverse Osmosis Membrane LG BW 400 ES 8-inch brackish water reverse osmosis membrane https://knapprochicago.com/products/lg-bw-400-es-l 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/LG_BW_400_ES_L_8_Inch_Brackish_Water_RO_Membrane_10500_GPD_Energy_Saving_Low_dP.png?v=1764183292 LG BW 400 ES L – 8" Reverse Osmosis Membrane LG BW 400 ES L 8-inch energy-saving brackish RO membrane, low dP spacer shown in multi-size comparison, 10500 GPD flow. https://knapprochicago.com/products/lg-bw-400-r 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/LG_BW_400_R_8_Inch_Brackish_Water_RO_Membrane_Element_10500_GPD_High_Rejection.png?v=1764183278 LG BW 400 R – 8" Reverse Osmosis Membrane LG BW 400 R 8-inch brackish RO membrane element, high-rejection cylindrical filter with labels, NSF-certified 10500 GPD. https://knapprochicago.com/products/lg-bw-400-r-g2 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/image_052d8a69-e31c-4ad8-8a8a-1d0c6b52397d.jpg?v=1772147951 LG BW 400 R G2 – 8" Reverse Osmosis Membrane LG BW 400 R G2 8-inch brackish water reverse osmosis membrane https://knapprochicago.com/products/xle-4021 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_2123ff17-49ae-4aeb-be4c-24de959c9db8.png?v=1777062239 DuPont FilmTec XLE-4021 – 4" Reverse Osmosis Membrane https://knapprochicago.com/products/espa4-ld-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_99a8cc84-eb26-4581-9899-d8a0d8ce0bd4.png?v=1777062240 Hydranautics ESPA4 LD 4040 – 4" Reverse Osmosis Membrane https://knapprochicago.com/products/bw30-pro-400-34 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_0e048a03-2e45-4901-85e0-c3be61b6b2be.png?v=1777062245 BW30 PRO-400/34 https://knapprochicago.com/products/cpa3-8 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_5061040f-e42d-4231-8392-b5a3f163417f.png?v=1777062248 CPA3-8 https://knapprochicago.com/products/esna1-lf-ld 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/9BNPY.jpg?v=1776309669 Hydranautics ESNA1-LF-LD Nanofiltration Membrane Element https://knapprochicago.com/products/xle-2540 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_c717220d-6cde-4684-ae53-188d9359c6a0.png?v=1777062252 Filmtec XLE PRO-2540 2.5" Membrane FilmTec XLE 2540 2.5 inch low energy RO membrane, tap water filter element, KnappRO https://knapprochicago.com/products/bw30xfrle-400-34 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_98c96f1b-b7e0-49a8-89be-d9b2eed50b19.png?v=1777062254 Filmtec BW30XFRLE-400/34 8" Element FilmTec BW30XFRLE 400/34 8 inch reverse osmosis element, anti-fouling brackish water filter, KnappRO https://knapprochicago.com/products/dow%C2%AE-filmtec%E2%84%A2-bw60-1812-75 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_8d96afcf-197b-4104-9012-7a77599096e3.png?v=1777062255 Dow® Filmtec™ BW60 1812 75 https://knapprochicago.com/products/dupont-filmtec-bw30xfrle-400-34i 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/BW30.jpg?v=1775874255 DuPont FilmTec™ BW30XFRLE-400/34i Extra Fouling Resistant Low Energy Brackish Water RO Membrane – 8" x 40" https://knapprochicago.com/products/xle-2521 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_b11fe0d9-5404-4730-b10e-bcfbd6f7ea61.png?v=1777062258 XLE 2521 XLE 2521 2.5 inch low energy reverse osmosis membrane, KnappRO tap water filter element https://knapprochicago.com/products/filmtec-hsro-4040-ff 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/HSRO-4040-FFImage.jpg?v=1751315132 Filmtec HSRO-4040 FF FilmTec HSRO 4040 FF reverse osmosis membrane, high-silica brackish water filter, KnappRO https://knapprochicago.com/products/espa2-ld-max 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_33ca2a92-9a72-4465-aef7-8fd6dab16a7a.png?v=1777062263 ESPA2 LD MAX ESPA2 LD MAX reverse osmosis membrane, energy-saving RO water filter, KnappRO industrial membrane https://knapprochicago.com/products/esna1-lf2-ld-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/yt9w7.jpg?v=1776309549 Hydranautics ESNA1-LF2-LD 4040 Nanofiltration Membrane Element https://knapprochicago.com/products/eco-pro-400i 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_5e119e8a-c690-440b-bf77-9da69e086227.png?v=1777062274 ECO PRO 400 ECO PRO 400 reverse osmosis membrane, eco-friendly RO filter element, KnappRO energy-saving membrane https://knapprochicago.com/products/xle-440 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_996fb7f1-4581-46d4-b540-4ea88d89bb62.png?v=1777062274 DuPont FilmTec™ XLE-440 Extra Low Energy Brackish Water RO Membrane – 8" x 40" https://knapprochicago.com/products/lc-le-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_2405a0bf-7c3d-46fd-baca-30cdd14554a9.png?v=1777062277 Filmtec LC LE PRO-4040 4" Membrane Element FilmTec LC LE PRO 4040 4 inch low energy RO membrane, KnappRO filter element https://knapprochicago.com/products/filmtec-bw30-400-34i 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_eab05774-910d-4162-a6a6-c93f378d22c3.png?v=1777062281 Filmtec BW30 PRO-400/34i https://knapprochicago.com/products/espa4-ld 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_ce6f70ad-74a8-4d46-ae4d-00c549747906.png?v=1777062285 ESPA4 LD https://knapprochicago.com/products/hydranautics-cpa2-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_f72c00f9-7cbd-440b-857f-468c42392e74.png?v=1777062285 Hydranautics CPA2 4040 https://knapprochicago.com/products/hsro-390-ff 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/Highsalinityrofilterstockimage.png?v=1777062237 HSRO-390 FF https://knapprochicago.com/products/espa1-7 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_f23c4f75-aa72-4ea8-bcd8-22615bc46d43.png?v=1777062288 ESPA1 7 https://knapprochicago.com/products/bw30-2540 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_a6564098-2e54-45ec-a178-38441a418376.png?v=1777062291 BW30 PRO-2540 https://knapprochicago.com/products/hydranautics-cpa5-ld-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_a5de0810-5fda-4dce-b746-62060b2152db.png?v=1777062293 Hydranautics CPA5 LD 4040 https://knapprochicago.com/products/bw30hr-440i 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_817607f9-cce3-49c8-9995-74d214b87819.png?v=1777062297 Filmtec BW30HR 440i 8" Membrane FilmTec BW30HR 440i 8-inch high rejection brackish water RO membrane https://knapprochicago.com/products/dupont-filmtec-bw30-pro-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_16005168-6e02-4597-bf44-170404f1864b.png?v=1777062299 DuPont FilmTec BW30 PRO-4040 DuPont FilmTec BW30 PRO 4040 brackish water RO membrane, KnappRO industrial water filter element https://knapprochicago.com/products/dupont-filmtec-bw30-365 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_0f650956-d90c-45d7-9780-4007201ef4de.png?v=1777062301 DuPont FilmTec BW30 PRO-365 https://knapprochicago.com/products/espa2-max 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_bab6a03c-2e94-48b8-9fde-2597add600ae.png?v=1777062302 ESPA2 MAX https://knapprochicago.com/products/espa2-ld 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_28cdcca1-5623-49c4-bbc3-4569651755d0.png?v=1777062303 ESPA2 LD https://knapprochicago.com/products/espa2-ld-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_a1677fee-59d7-452a-9be7-6ca2bce9b700.png?v=1777062307 ESPA2 LD 4040 Energy Saving Polyamide Membrane ESPA2 LD 4040 polyamide reverse osmosis membrane, energy-saving RO filter element, KnappRO purification https://knapprochicago.com/products/xle-pro-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_4a6572c8-0fb3-47d3-972c-c52bc893663c.png?v=1777062308 Filmtec XLE PRO-4040 4" Membrane FilmTec XLE PRO 4040 4-inch low energy reverse osmosis membrane https://knapprochicago.com/products/espa1-ld-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_c0046342-39a0-444a-a886-47aa84ae2b9d.png?v=1777062310 ESPA1 LD 4040 Energy Saving Polyamide Membrane ESPA1 LD 4040 polyamide reverse osmosis membrane, energy-saving RO filter, KnappRO water treatment membrane https://knapprochicago.com/products/cpa5-ld 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/Hydranautics_CPA5_LD_8-inch_high-performance_brackish_water_RO_membrane.png?v=1777062311 Hydranautics CPA5 LD 8" Membrane Hydranautics CPA5 LD 8-inch high-performance brackish water RO membrane https://knapprochicago.com/products/cpa7-max 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_c299b13a-0f3b-4dcd-a5c0-767ef0d9f19d.png?v=1777062311 CPA7 MAX https://knapprochicago.com/products/bw30hrle-440i 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_eeba78dd-25c8-4815-9069-45917b427a4b.png?v=1777062313 DuPont FilmTec™ BW30HRLE-440i High Rejection Low Energy Brackish Water RO Membrane – 8" x 40" https://knapprochicago.com/products/cpa5-max 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/cpa7-ld 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_a64c5520-44c8-4f1e-b77d-4be47f9976a8.png?v=1777062313 Hydranautics CPA7 LD 8" Membrane Hydranautics CPA7 LD 8 inch reverse osmosis membrane, brackish water RO filter, KnappRO industrial water purification https://knapprochicago.com/products/tw30-2514 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_8fef2d22-40e9-4ba1-ba5d-8f0acd41c153.png?v=1777062253 DuPont FilmTec TW30-2514 – 2.5" Reverse Osmosis Membrane https://knapprochicago.com/products/dow%C2%AE-filmtec%E2%84%A2-tw30-1812-50 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_f2ed89f6-89b9-4cc0-aa64-5e91c7c39c1c.png?v=1777062258 Dow FilmTec, TW30-1812-50HR - 50 gpd TFC High Rejection Membrane for Undersink Reverse Osmosis (RO) System (Replaces Model TW30-1812-50) https://knapprochicago.com/products/ami-m-t2526a 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/AMIPhoto.png?v=1762977612 AMI M-T2526A – 2.5" Reverse Osmosis Membrane https://knapprochicago.com/products/tw30-pro-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_83680f3c-123a-4ee2-ae9a-5a163fe79811.png?v=1777062261 DuPont FilmTec TW30 PRO-4040 – 4" Reverse Osmosis Membrane https://knapprochicago.com/products/nf-400 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/tt-1812-50 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_b6e37820-c0f2-4c85-aacd-2895a12a3086.png?v=1777062273 DuPont FilmTec TT-1812-50 – 1.8" Reverse Osmosis Membrane https://knapprochicago.com/products/tw30-4014 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_125bb3ce-c733-4ac4-9f1f-175b0891a547.png?v=1777062273 DuPont FilmTec TW30-4014 – 4" Reverse Osmosis Membrane https://knapprochicago.com/products/esna1-lf2-ld 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/ESNA1LF2LD.png?v=1776309204 Hydranautics ESNA1 LF2 LD – 8" Membrane https://knapprochicago.com/products/dow%C2%AE-filmtec%E2%84%A2-tw30-1812-75 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_5723a5ff-7983-42cf-9d1f-da024bb79e0d.png?v=1777062281 DOW® FilmTec™ TW30-1812-75 – 1.8" Reverse Osmosis Membrane https://knapprochicago.com/products/esna1-lf-ld-4040 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/Lqk4i.jpg?v=1776309446 Hydranautics ESNA1 LF LD 4040 – 4" Membrane https://knapprochicago.com/products/filmtec-tt-1812-75 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_1c3b1b61-41e9-4891-ba2a-8ac533fad8ee.png?v=1777062282 DuPont FilmTec TT-1812-75 – 1.8" Reverse Osmosis Membrane https://knapprochicago.com/products/tw30-2521 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/f7a82a58-1589-4453-a6cd-26d32b6e78ae.jpg?v=1772143009 DuPont FilmTec TW30-2521 – 2.5" Reverse Osmosis Membrane https://knapprochicago.com/products/nf270-2540 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/nf90-4040 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/dow%C2%AE-filmtec%E2%84%A2-tw30-1812-36 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_d08f611a-8387-4818-8d94-b25dd8108711.png?v=1777062287 DOW FilmTec TW30-1812-36 – 1.8" Reverse Osmosis Membrane https://knapprochicago.com/products/tw30-2026 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/411dc2d2-d13e-4086-b7e4-240c0a4e0809_1.jpg?v=1772143356 TW30-2026 2" Tap Water 220 GPD RO Membrane https://knapprochicago.com/products/nf90-400-34i 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/ro-4040-ff 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/tw30-4021 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_1c6a2494-7a0a-48ad-abd4-c8d038b81853.png?v=1777062296 TW30-4021 – 4" Reverse Osmosis Membrane FilmTec TW30-4021 4-inch tap water reverse osmosis membrane https://knapprochicago.com/products/dupont-filmtec-ro-390-ff 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/RO390FFImage.png?v=1743179905 DuPont FilmTec RO 390 FF – 8" Reverse Osmosis Membrane DuPont FilmTec RO 390 FF 8 inch reverse osmosis membrane, industrial RO water filter element, KnappRO purification membrane https://knapprochicago.com/products/px05-20-suez-purtrex-spun-poly-filter-case-20-filters 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/image_0009ef78-0cd0-48eb-9bac-b46eccd07e3c.jpg?v=1772852065 PX05 20 SUEZ Purtrex Spun Poly Filter Case (20 filters) https://knapprochicago.com/products/tw30-1812-100hr 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_ff39792b-cdd8-4697-a73c-acf405b8cc99.png?v=1777062298 DuPont FilmTec TW30-1812-100HR – 1.8" Reverse Osmosis Membrane https://knapprochicago.com/products/tw30-2540 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_ed65caf9-715e-43cb-b962-7512036a5557.png?v=1777062305 DuPont FilmTec TW30 PRO-2540 – 2.5" Reverse Osmosis Membrane https://knapprochicago.com/products/nf270-400-34i 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/nf90-2540 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/nf270-4040 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/nf-4040 2026-04-30T16:06:41-05:00 daily https://knapprochicago.com/products/lg-sw-400-r 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/LG_SW_400_R_8_Inch_Seawater_RO_Membrane_Element_9000_GPD_High_Rejection.png?v=1764183266 LG SW 400 R – 8" Reverse Osmosis Membrane LG SW 400 R 8-inch seawater RO membrane, energy-efficient cylindrical filter in packaging, 9000 GPD with 99.85% rejection. https://knapprochicago.com/products/lg-sw-440-r 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/LG_BW_400_ES_8_Inch_Brackish_Water_RO_Membrane_Element_11500_GPD_Energy_Efficient.png?v=1772148034 LG SW 440 R – 8" Reverse Osmosis Membrane LG BW 400 ES 8-inch brackish water reverse osmosis membrane, energy-efficient with honeycomb structure, 11500 GPD output. https://knapprochicago.com/products/swc5-max 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_292d438b-4862-40ef-8cee-14779a9657c2.png?v=1777062262 Hydranautics SWC5 MAX – 8" Reverse Osmosis Membrane hydranautics swc5 max 8 inch seawater ro membrane, knappro hydranautics swc5 max desalination filter, swc5 max reverse osmosis seawater membrane https://knapprochicago.com/products/swc5-ld 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_3bbc1d18-2fb6-4bb6-af22-fefae7d27836.png?v=1777062247 Hydranautics SWC5 LD – 8" Reverse Osmosis Membrane hydranautics swc5 ld 8 inch seawater ro membrane, knappro hydranautics swc5 ld desalination filter, hydranautics 8" seawater reverse osmosis element https://knapprochicago.com/products/sw30xhr-440i 2026-04-30T16:06:41-05:00 daily https://cdn.shopify.com/s/files/1/0739/9453/5152/files/download_4e31dde5-2dfd-420c-b5ec-e645a1926fcd.png?v=1777062250 SW30XHR 440i – 8" DuPont FilmTec Reverse Osmosis Membrane sw30xhr 440i dupont filmtec seawater membrane, knappro sw30xhr 440i 8 inch desalination filter, extra high rejection ro membrane sw30xhr 440i https://knapprochicago.com/products/seamax-440-ale 2026-04-30T16:06:41-05:00 daily 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