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Hot Spring Tri-X Filters: How They Work, How to Clean Them, and When to Replace Them Most hot tub owners think about their filter only when the water starts to look dull or the jets feel weak. Hot Spring owners have a bit of an advantage here, because Hot Spring spas are designed around a filtration layout that does more of the work automatically, and many models use the Tri-X filter, a cartridge built very differently from the pleated filters most people picture. Understanding how that filter i … read more