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Why Choose StonyLab? 1. The StonyLab means high-quality products for reasonable prices. 2. We boast excellent customer service with a high satisfaction rating, with our team of representatives ready to assist you Monday to Friday, from 9:30AM to 5:30PM Eastern Time. 3. We pack and ship your orders directly from our US-based warehouse within 24 business hours, and tracking information will be provided to you as soon as it's available. Description Coarse cellulose filter papers remove particles > 20 µm. Filtration Speed: 35 - 70 sec. Ash content: ≤0.15%. StonyLab ensures high quality and premium customer service.