The first thing you want to do is to consider the company that makes the various options you'll have in a shower filter. Avoid companies that are new on the block, or that don't seem to have technology on their side. You want to choose a proven leader that has the experience to make the best products. Take a look around the website of any company you're considering and ask yourself how professional it seems.
You also want to make sure that the shower filter you choose is going to work to filter out the specific things you need filtered out. For example, you might want to make sure that it will remove chlorine, hydrogen sulfate, bacteria or metals like lead. The right option will vary based on the particular issues in your area with your water supply. Remember that having extra protection is never a bad thing, while not having enough can indeed be a bad thing.
Make sure that the shower filter you choose is able to be used in hot as well as cold water. The key to finding the right filter is versatility. It should be able to be used with any type of water in your home. You never know when you might have the need for a cold rinse, and the last thing you want is to have a filter that will only work with hot water. You should also keep in mind that in an emergency situation, you often won't have hot water, yet water filtration will be more important than ever.
Of course you also want your shower filter to remove chemicals that can weigh down your skin and hair. The point of taking a shower is to clean and refresh yourself, yet if you're using the wrong filter you can end up not being either. Make sure that the filter you choose will provide clean water and remove the chemicals that can add build up to your hair. It should also make the water taste delicious so that you don't have to worry about water seeping into your mouth.
As you can see, there are several things to consider when choosing a shower filter. You want to choose one that can be used on both hot and cold water, from a company like www.bigberkeywaterfilters.com that has the experience and expertise to make the best filters in the business. You also want your filter to remove the things you want removed and to provide water that's not just safe, but is gentle on the hair and skin.