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Color Disc for measuring Nitrite Nitrogen, 0-100, 0-2000 mg/L. Used in test kit Model NI-6 (Prod. No. 224000) and Model PBC-DT (Prod. No. 2350700). The most accurate visual test kit method, Hach colo

Color Disc for measuring Iron FerroVer®, 0-1 mg/L. Used in test kit Model IR-18A (Prod. No. 146500). The most accurate visual test kit method, Hach color discs provide fast, accurate comparisons

Color Disc for measuring Nitrate Nitrogen, 0-1, 0-10 mg/L. Used in test kit Model NI-14 (Prod. No. 1416100), Nitrate Education Test Kit (Prod. No. 1416133), and Stream Survey Test Kit (Prod. No. 27120

Large 1600-grain water softener, without resin. Capacity nearly double that of most softeners.For use with AD-16E Test Kit., P/N-148410.

Demonstration softener with convenience features. Body of clear polycarbonate plastic. White elliptical base helps prevent upset while in use. Both ends extra thick, white polycarbonate. Quick connect