Beachcomber’s product called Deep Clean 5 is an effective internal pipe cleaner. Always follow the directions on the label. Regular shocking and simple maintenance of your hot tub, to keep water clean will also help to keep internal plumbing clean. But if the hot tub is under heavy use, super-chlorination is in order to rid the water of biofilm and any buildup in the pipes. Check the formula in your Owner’s Guide for draining recommendations; we recommend on a rule of thumb, to drain about every three months under normal use. A fresh water fill to start again can solve a lot of cloudy water problems. We don’t recommend that your hot tub be left unattended for periods of time.