We are in South Florida and will be here until April of next year. I washed the coach and car today and had horrible water spots when everything dried. Was told by some other people at the park that its common here. I guess its hard water. I used to use the cheap inline outdoor filter, but quit a while back. Would this solve my problem or do I need something more complex. I don't want to cause problems with my plumbing system. Been here for 4 weeks already. Suggestions?