Eradication of "Ich" from a pond is very difficult during the winter months since the encysted forms (resistant to chemical treatment) remain in the system for long periods of time.
(Eradication of "Ich" from a pond; is; very difficult) (the encysted forms (resistant to chemical treatment; remain; in the system)
Eradication of "Ich" from a pond the encysted forms (resistant to chemical treatment
is remain
very difficult
in the system