Filter paper for fine precipitates, with very high particle retention and slow flow rate. Excellent clarifying filter for cloudy suspensions and for water and soil analysis. - Filtration speed acc. to DIN 53137: 100 s. - Thickness: 0.17 mm. - Weight: 75 g / m². Filter paper for fine precipitates, with very high particle retention and slow flow rate. Excellent clarifying filter for cloudy suspensions and for water and soil analysis. - Filtration speed acc. to DIN 53137: 100 s. - Thickness: 0.17 mm. - Weight: 75 g / m².