stonylab Quantitative Filter Paper Circles, 150mm Diameter Cellulose Filter Paper with 20 Micron Particle Holding Medium Filtration Speed, Pack of 100 (150mm Diameter)

StonyLab Quantitative Filter Paper Circles, 150mm Diameter Cellulose Filter Paper with 20 Micron Particle Retention Medium Filtration Speed, Pack of 100 (150mm Diameter)

stonylab Qualitative Filter Paper, 100 Packs Slow Flow Rate Cellulose Filter Paper Circles with 10 Micron Particle Retention, 94 mm Diameter