How to Keep a Hot Tub Clean. A hot tub is a great addition to any home. What better way to relax after a hard day at work than a soak in a nice hot tub with jets massaging away the aches and pains of the day? Keeping a hot tub clean in important because you don't want the hassle and waste of refilling the water too often. There are a few important things you can do to keep your hot tub clean.