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Keep your SEIWA AquaSilk performing at its best with the AquaSilk Refill Pack. The Vitamin C Cartridge helps neutralize chlorine, while the PP Filters capture rust and visible impurities before they reach your skin and hair. Replace regularly to maintain cleaner, softer-feeling shower water. 6 Months: 2x 3-Month Pack (2 Vitamin C + 4 PP Filters) 12 Months: 4x 3-Month Pack (4 Vitamin C + 8 PP Filters) Each pack contains: 1x Vitamin C Cartridge 2x PP Filters Recommended replacement: Every 2–3 months for each 3-month pack.