Incoming water is treated with copper and aluminum by the controlled electrolytic dissolution of anodes of these materials to produce copper ions and aluminum hydroxide. Presence of copper in water inhibits veliger activity and development through direct toxicity. The aluminum hydroxide has a flocculent activity that aids in precipitating veligers, and it forms an anodic, fluid film on surfaces, which acts as an antifouling coating to inhibit biofilm formation and postveliger settlement. This activity also reduces potential for microbiologically induced corrosion.