Upgrade: The water filter features an additional rubber seal layer to prevent unfiltered water from leaking. The filter housing is made of environmentally friendly, food-grade plastic for safe filtration. Multi-layer Filtration: Our water purifiers use a multi-layer filtration system with activated carbon and an ion exchange resin to reduce odors. We include 30% more resin than other filters in the ion exchange process (the visible yellow substance is resin), which helps reduce TDS and removes calcium, magnesium, chlorine, and other ions from water. Note: Filtration performance may vary depending on your water source. Protect the Environment: Each filter can purify approximately 40 gallons of water, equivalent to reducing the use of about 500 plastic bottles (300ml each) of drinking water. This helps minimize plastic waste and supports environmental protection. Replacement Models: Compatible with Zero Water pitchers models ZR-001, ZR-003, ZR-004, ZR-006, ZR-008, ZR-012, ZR-017, ZR-600, ZP-007RP, ZD-013W, ZD-013D, ZR-0810G, ZR-0810-4, ZP-010, ZD-010RP, ZS-011RP, ZD-012RP, ZD-20RP, ZD-018, ZD-030RP, ZJ-003, ZJ-004S, ZP-006-4, ZBD-040-1. For optimal performance and fresh-tasting water, we recommend replacing the filter every month. Replace the filter when the water begins to taste sour or off. Color: White Material: Plastic + Resin Package Contents: 3 x Water Filters (only items included; other accessories not included). Note: Lighting and display differences may cause slight color variations between the image and the actual product. Measurement may vary by +/- 1-3 cm.