Filters plus copper-silver ionization?

Are there any adverse or contridicting effects of using point-of-use filters and a copper-silver ionization system at the same time?

No, antagonism between these modalities is not a problem.

See the following reprints concerning disinfection:

Prevention of Hospital-Acquired Legionellosis

Controlling Legionella in Hospital Drinking Water: An Evidence-Based Review of Disinfection Methods

Abbreviated duration of superheat and-flush and disinfection of taps for Legionella disinfection: Lessons learned from failure

Experiences of the first 16 hospitals using copper-silver ionization for Legionella control: Implications for the evaluation fo other disinfection modalities

Preventing Legionellosis