Application Strategies

Apply these compounds as follows:

1. Continuous, intermittent, or as needed. Frequency of feeding and duration of treatment depend upon severity of problem.

2. Periodic, short-term (6 to 24 hr) applications to water on a proactive basis to prevent mollusks from growing to a fouling size.

3. Intermittent or slug method: when system is noticeably fouled, apply initial dose to achieve control. Repeat the process periodically to inhibit recolonization by larvae (veligers) and juvenile clams and mussels.

4. Applications may be able to be conducted off-line or at reduced flow.

5. Registered use areas in which to control mollusks with these products are as follows:

   1. CT-1: recirculating and once-through cooling systems, influent cooling systems, auxiliary water and wastewater systems, fire protection systems, intake pump bays and intake screen area, storage tanks and associated piping, settling ponds or lagoons, transport spillways or canals.

   2. CT-2: recirculating and once-through cooling systems, service water, auxiliary water, influent, fire protection, and waste water systems. For auxiliary water/service water and wastewater systems, may be added to the system water or by spraying onto a waste pile as needed.

   3. CT-3: cooling towers and once-through freshwater cooling systems.

   4. CT-4: once-through freshwater cooling systems.

Sensitivity of various life stages has been studied by Waller et al. (1993) and Fisher et al. (1994).

Zebra Mussel Chemical Control Guide

CLAM TROL