I run mine through an RV water filter when I put it on the boat, and don't do anything else with it at all. No problems in years.
USE the water in the tank even while at the dock; don't simply hook up to shore water and let the water in the tank go stale. Also only put in as much water as you expect to use in a reasonable time plus a little reserve, that way you'll change out the water quicker.
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Willie
She's a tired old barge but she's paid for!
http://s71.photobucket.com/alb...p;current=ef324993.pbw