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Hot tub manufacturers recommend replacing your hot tub filter at least once a year and cleaning it every month. If you use your hot tub regularly, or if your hot tub is in an area with high levels of contaminants, you may need a new filter every six months. The quality of your hot tub filter will also affect replacement time, with some high-quality filters lasting 2-3 years, while inferior ones may only last a few months.
According to the recommendations of most manufacturers and industry experts, hot tub filters should generally run at least 8-12 hours a day to ensure effective filtration and water quality maintenance.