{"product_id":"nelsen-ro-replacement-filter-pack","title":"MAW-50 Replacement Filter Pack (4-Stage \u0026 5-Stage)","description":"\u003cdiv class=\"product-description-seo\"\u003e\n\u003ch2\u003eMAW-50 Replacement Filter Pack - Everything Your Yearly Filter Change Needs\u003c\/h2\u003e\n\n\u003cp\u003eThis is the complete replacement cartridge set for the \u003ca href=\"\/products\/maw-50-reverse-osmosis-system\"\u003eMAW-50 reverse osmosis system\u003c\/a\u003e, sold in the exact count your configuration needs. Change the pack every \u003cstrong\u003e6 to 12 months\u003c\/strong\u003e and the system's 50 GPD membrane stays protected and productive for years.\u003c\/p\u003e\n\n\u003ch3\u003ePick the Pack That Matches Your System\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-Stage Pack ($49)\u003c\/strong\u003e - fits the MAW-50 4-stage (NRO4-50): 1x NP5 sediment cartridge, 1x Matrikx carbon block (32-250-125-975), 1x inline carbon post-filter (NINCF-10-QC).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-Stage Pack ($59)\u003c\/strong\u003e - fits the MAW-50 5-stage (NRO5-50): the same set plus a \u003cstrong\u003esecond Matrikx carbon block\u003c\/strong\u003e, matching that system's twin carbon pre-filter stages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure which system you have? Count the vertical housings under the sink: three means 4-stage, four means 5-stage. Or text a photo to \u003cstrong\u003e800-460-5810\u003c\/strong\u003e and we will tell you in a minute.\u003c\/p\u003e\n\n\u003ch3\u003eWhy the Schedule Matters\u003c\/h3\u003e\n\u003cp\u003eThe carbon blocks exist to strip chlorine before it reaches the thin-film composite membrane. Exhausted carbon is the number one early killer of RO membranes: stretch a $49 pack too far and the $135 membrane pays for it. The MAW-50's \u003cstrong\u003eclear sediment housing\u003c\/strong\u003e makes timing easy; when the cartridge looks loaded, change the pack. The swap takes about 15 minutes with the included filter wrench.\u003c\/p\u003e\n\n\u003ch3\u003eThe Membrane Is Separate, On Purpose\u003c\/h3\u003e\n\u003cp\u003eThe \u003ca href=\"\/products\/tfc-50-replacement-membrane\"\u003eTFC-50 replacement membrane\u003c\/a\u003e ($135) changes every \u003cstrong\u003e2 to 3 years\u003c\/strong\u003e, a different schedule than the filters, so bundling it would charge you for a membrane you usually do not need yet. A cheap TDS meter at the RO faucet tells you when it is time: when the reading creeps up, replace the membrane.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFree shipping. 7-day-a-week support. Real water treatment specialists with 30+ years of experience.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Mid Atlantic Water","offers":[{"title":"4-Stage Pack (NRO4-50)","offer_id":54192358719772,"sku":"NRO4-FILTERPACK","price":49.0,"currency_code":"USD","in_stock":true},{"title":"5-Stage Pack (NRO5-50)","offer_id":54192358785308,"sku":"NRO5-FILTERPACK","price":59.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9523\/4605\/files\/nro-filterpack-2000_3bfd1177-b8b7-4943-8f6d-73a334a9d4fc.png?v=1781120757","url":"https:\/\/midatlanticwater.net\/products\/nelsen-ro-replacement-filter-pack","provider":"Mid Atlantic Water","version":"1.0","type":"link"}