Calcium chloride does not do significant damage to gutters when used properly and in moderate amounts. If you use too much too frequently, it could eventually cause corrosion in your gutters. Rock salt will harm your gutters, though.

Once you’ve installed your gutters, you'll need to maintain them. You should clean your gutters once or twice a year to keep them functioning correctly. But if climbing a ladder and scooping out handfuls of wet leaf gunk is just not your thing, you can hire a professional gutter cleaner near you to do the job. 

With routine maintenance, gutters don’t usually need to be replaced for 20 years, but there are warning signs that they might need early replacement. Signs that your gutters need to be replaced include sagging, visible cracks or holes, peeling paint, rust, standing water in your gutter, and water leaking into your basement. Pushing off replacing your gutters can lead to extensive damage to both the interior and exterior of your home. Regular maintenance can help your gutters last all 20 years — and sometimes, even longer. 

The gutter gauge is a measurement of the thickness of the gutter material. If you have gutters that are too thick and heavy for the screws and brackets holding them in place, they may sag. Materials that are too thin could suffer damage that leads to sagging. A professional gutter installer can ensure you have the right gutter gauge.