www.d1spas.com D1s UltraPure® PLUS Water Management System has been the industry’s premier ozone-based hot tub water management system since it was first invented and introduced by D1 in 1996. It represents the worlds first UL-approved system that ozonates water while users occupy the hot tub! In D1s UltraPure® PLUS System, water travels through the hot tubs plumbing where the meticulous scrubbing and polishing process begins. Twin filters start the cleansing by picking up large debris.
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