When using a wood fired pool heater or wood fired hot tub heater, it is important to monitor the water quality to ensure it is clean and free of unwanted bacteria that can form in hot water. Traditionally, chemicals such as chlorine and bromine have been widely used to ensure clean water. However, there are other simple tricks that when implemented can extend the water clarity in a hot tub or pool without the need for harsh chemicals. This applies more so to wood fired hot tubs as pools will all have existing sanitization and filtering system in place.
By using some of these tricks you will find your water stays clean longer. However, use common sense, hot water breeds bacteria quicker than cold water. If your water looks or smells foul, then drain it! Clean water is always best. There is no way to test for bad water so error on the safe side and drain the tub often to avoid poor water quality.