Upgrade: This 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 and reliable filtration. Multi-layer Filtration: Our water purifiers utilize a multi-layer filtration system with activated carbon and an ion exchange resin to reduce odors and improve taste. We include 30% more ion exchange resin than comparable filters (the visible yellow substance is the resin), which helps reduce TDS and remove calcium, magnesium, chlorine, and other ions. Note: Actual filtration performance may vary depending on your water source. Protect the Environment: Each filter can purify up to 40 gallons of water, equivalent to saving approximately 500 plastic bottles (300ml each) of drinking water. This reduces plastic waste and supports environmental sustainability. 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 flat. Color: White Material: Plastic + Resin Package Contents: 3 x Water Filters (only the items listed are included; other accessories are not included) Note: Lighting and display differences may cause slight variations in color between the image and the actual product. Measurement may vary by +/- 1-3 cm.