3-Stage Filtration Replacement Kit for xTool Smoke Purifier for S1/M1/M1 Ultra/F1 Ultra/P2/D1(Not for F1), Includes 2 Pre-Filters, 1 Middle Filter and 1 Main Filter

["Upgraded 3-Layer Filtration System: filter replacement kit for xTool smoke purifier for S1/M1/M1 Ultra/F1 Ultra/P2/D1(Not for F1),. We suggest you replace it every 3-6 months (depends on the use time and frequency)","Pre-Filter: captures visible smoke and dust. Our pre-filter is much thicker and has 2.5 times longer lifespan than others on the market","Middle Filter: effectively absorbs and filters harmful particles down to 0.3µm with 99.97% purification rate","Main Filter: absorbs and removes harmful gases and unpleasant odors with the high-performance premium activated carbon","Package Includes: Pre-filter *2, Middle filter *1, Main filter *1"]