equivalent to Whatman/Schleicher Schüll article No. 10310645, 0310745. Slow, phosphate-free filter paper for soil analysis. Typical measurements: orthophosphate: <0.005 mg/L (DIN EN ISO 6878); Total nitrogen bounded: <0.5 mg/L (DIN EN 12260); Calcium: <0.5 mg/L (EN ISO 11885); Magnesium: <0.5 mg/L (EN ISO 11885).