Hot tubs are pretty easy to maintain. If you have a quality tub with good parts, maintenance should take no more than an hour per week with regular use. You'll need to do weekly water quality tests and add any necessary cleaning or balancing chemicals. And every month, you'll need to clean or change the filters. Plus, of course, it's necessary to change the water every three to four months. Professional hot tub maintenance is similar to the cost of pool maintenance.