DIFF Subgroup
C02F 1/505 Full Title
Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) > by addition or application of a germicide or by oligodynamic treatment
C02F 1/505 Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) > by addition or application of a germicide or by oligodynamic treatment