What you experience with filters is about right BIG. How deep in the lake is your intake line. I did some diving this year in front of my house and was suprised at the concentration of alge growing on every thing above 35 feet. Fertilizers must be causing this growth as I don't remember it like that years ago. PEX or copper doesn't matter to bacteria growth. One to 2 hours of contact should be sufficient. Remember this is a precautionary proceedure in case something gets in the pipe and dies. I changed the flex connectors on my toilets to the new oring hand tight type so it is easily disconnected from the toilet end. Just flush the treated water into a pot or small bucket until clear, then reconnect toilet.
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