MAW-50 Replacement Filter Pack (4-Stage & 5-Stage)

MAW-50 Replacement Filter Pack - Everything Your Yearly Filter Change Needs This is the complete replacement cartridge set for the MAW-50 reverse osmosis system, sold in the exact count your configuration needs. Change the pack every 6 to 12 months and the system's 50 GPD membrane stays protected and productive for years. Pick the Pack That Matches Your System 4-Stage Pack ($49) - 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). 5-Stage Pack ($59) - fits the MAW-50 5-stage (NRO5-50): the same set plus a second Matrikx carbon block, matching that system's twin carbon pre-filter stages. Not 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 800-460-5810 and we will tell you in a minute. Why the Schedule Matters The 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 clear sediment housing makes timing easy; when the cartridge looks loaded, change the pack. The swap takes about 15 minutes with the included filter wrench. The Membrane Is Separate, On Purpose The TFC-50 replacement membrane ($135) changes every 2 to 3 years, 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. Free shipping. 7-day-a-week support. Real water treatment specialists with 30+ years of experience.