Are you looking to get a water filter for your home? Where is the best place to buy one? Water filter systems can be purchased: 1) Online … 2) In Hardware Stores … 3) Home Improvement Stores. Most people just need something for their faucet to purify their drinking water. Others are going to need Whole House Water Filter Systems that will purify all the water that enters into the house. Both ways are fine. If you do not want to change the filter too often, the whole house option might be the way to go. Do a comparison online and make your decision after that.