MACROTROL 9210 and the more concentrated NALCO 9380 are water-soluble quaternary ammonium-based products of the n-alkyl dimethyl benzyl ammonium chloride type. They have penetrating and dispersing characteristics and act as nonoxidizing biocides. They are labeled for use in a wide range of water systems where they can control macroorganisms such as mollusks, clams, and barnacles, as well as microfoulants such as bacteria, fungi, and algae (Dobbs et al. 1995). They are effective in seawater as well as freshwater systems. Excess residues of NALCO 9380 and MACROTROL 9210 must be deactivated or detoxified prior to treated water discharge to a receiving stream.
Monitoring kits for use in checking zebra mussel veliger density and settling in a water system and experimental systems for determining adult mussel mortality under local water quality conditions are available from the source, Nalco Chemical Company (address given in next section).
Chemical Name and Commercial Formulations
Timing and Appearance of Effects
Field Instructions and Guidance on Operational Applications
Adjuvant/Detoxicant/Deactivant Use