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Here are four common things that cause your hot tub to stink: Number one, your pH levels are off. Number two: your chlorine or bromine is too low, Number three, your hot tub Plumbing is full of bofilm or number four, your hot tub cover is full of water. Whatever the reason, the smell means you've got a buildup of bacteria and contaminants. The solution test and balance your water weekly.
Flush your hot tub lines with a plumbing cleaner and replace your hot tub cover if it's too water logged.
Rip Matthew Perry