To prevent bio-fouling in seawater systems
– Chlorination by chlorine gas or hypo chlorite, typically up to 0.5
ppm residual chlorine (Cl2 + HOCl + OCl-)
– Combined Cu and chlorine, typically 5 ppb Cu and 0.1 ppm residual chlorine
Assuming this is a flow-through system, the best way to control corrosion is matarial selection.
The best way to control fouling is material selection plus an injection of a biocide or film-forming material.
Be aware, though, the environmentalists out there tend to oppose both.
Some organizations are tring to ban copper-rich piping (copper-nickel), while at the same time are trying to ban chlorination and other biocides.
I'm familier with several systems that generate copper, however they don't produce enough coppere to do anything when the pumps are on, and the onl;y benefit is when the pumps are off. This could be a viable process, except environmental restrictions (current and/or future) on "slugs" of copper rich discharges when you turn the pumps on.