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We are 4 yrs into our hot tub. I think dichlor is extremely easy. We have not had a water issue in 4 yrs. Water is always clear and smells good. We've gone without a Nature2, once. Water had a stale smell after about 45 days. Next fill up we put in a Nature2, never again had an odor. Maybe its a coincidence, but for us...dichlor and Nature2 make us very happy spa owners.