Universal Whole House Filter or Undersink Reverse Osmosis RO Replacement Set of 18 filter cartridges: Sediment, GAC, CTO Carbon Block. 3 Year Supply. Free Shipping.

Description 3-Stage Replacement Filter Set – Sediment GAC Carbon Block (18 Cartridges Total) This 3-Stage Replacement Filter Set includes a total of 18 filter cartridges (6 of each type), designed for use in undersink reverse osmosis (RO) systems and whole house filtration systems with 3/4″ Port that utilize standard 10″ slim cartridges. The set provides complete multi-stage filtration to help reduce sediment, chlorine, chloramine, VOCs, and improve overall water taste and odor. Stage 1 – 5 Micron Sediment Filter Size: 9 7/8″ × 2.5″ Removes dirt, silt, sand, rust, and scale particles. This pre-filter protects downstream carbon filters and helps extend the life of the overall filtration system. Purpose: Use as the first stage in undersink RO systems and whole house filters. Micron Rating (Nominal): 5 Micron Operating Temperature: 36°F – 100°F Maximum Flow Rate: up to 8 GPM Maximum Pressure: 100 PSI Quantity: 6 cartridges Stage 2 – GAC Granular Activated Carbon Filter Size: 9 7/8″ × 2.5″ Effectively reduces chlorine, chloramine, VOCs, and improves unpleasant taste and odor. Granular activated carbon provides high adsorption capacity and consistent performance. Purpose: Use as the second stage in undersink RO or whole house filtration systems. Micron Rating: Not rated (GAC media) Operating Temperature: 36°F – 100°F Maximum Flow Rate: up to 8 GPM Maximum Pressure: 100 PSI Quantity: 6 cartridges Stage 3 – Carbon Block Filter Size: 9 7/8″ × 2.5″ Provides fine carbon filtration to further reduce chlorine, chloramine, VOCs, and improve taste and odor for clean, great-tasting water. Purpose: Use as the third stage in undersink RO or whole house filtration systems. Micron Rating (Nominal): 10 Micron Operating Temperature: 36°F – 100°F Maximum Flow Rate: up to 8 GPM Maximum Pressure: 100 PSI Quantity: 6 cartridges Key Benefits Complete 3-stage replacement filter set (18 cartridges total) Good for 6 replacements Improves water taste, odor, and clarity Helps protect plumbing, fixtures, and appliances Standard 10″ slim cartridge size (9 7/8″ × 2.5″) Compatible with many undersink RO and whole house systems Compatibility Fits most systems using standard 10″ × 2.5″ filter housings Suitable for undersink RO systems and whole house filtration setups Maintenance Typical replacement interval: every 6–12 months per stage, depending on water quality and usage Replace sooner if pressure drop or reduced filtration performance is observed Brand: Aqua / MyWaterClub SKU: 3UF18 ASIN: B01J34R5O2