Terbuthylazine is an algicide, microbicide and microbiostat used to
control slime-forming algae, fungi, and bacteria. It is registered for use in
commercial and industrial water cooling systems, and in residential and
commercial ornamental ponds, fountains and aquaria. Terbuthylazine is
formulated as a soluble concentrate/liquid, and is applied as a continuous
feed or intermittent slug treatment, using either open pouring or closed
system methods.