The Aqua Reverse Osmosis Replacement Set (5 Pieces) includes 1 PPF Sediment Filter, 1 GAC Carbon Filter, 1 CTO Carbon Block Filter, 1 T-33 Inline Filter, and 1 RO Membrane. Designed for most standard RO water purifiers, it helps reduce sediment, chlorine, bad taste, odor, TDS, and other contaminants while delivering clean and healthy drinking water.