[Applicable to TE-6/TE-6A/TE-3/TE-6-1 and all other series] One-year supply includes: TE-A1 * 4 pcs, TE-A2 * 2 pcs, TE-A3 * 1 pc Specifications: [TE-A1: Stage 1] * Suitable for Stage 1 * Professional precision quick-change SGS certified 5M fiber filter cartridge * Filters larger and smaller solid sediments, fine sand, silt, rust, and microorganisms in water * Replace filter every 3-6 months [TE-A2: Stage 2] * Suitable for Stage 2 filter or EW-7 Stage 3 filter for Tiankang water dispensers * Professional precision quick-change SGS certified high-adsorption coconut shell activated carbon filter cartridge * Uses top-quality coconut shell activated carbon to filter odors, organic elements, carcinogens, such as chlorine, pesticide residues, etc. in water * Replace filter every 6 months [TE-A3: Stage 3] * Suitable for Stage 3 - Fine filtration * Professional precision quick-change SGS certified 1M fiber filter cartridge * Can filter fine impurities, rust, etc. larger than 1 micron * Replace filter every 9-12 months