Easy To Use and Replace : Just place this spa mineral stick in your spa filter or skimmer basket, not other complicated process needed, recommended to replace it once 3-4 months Keep Water fresh and Clear for Long Time: Effective hot tub supplies to maintain water fresh and clear while not using your spa or hot tub for long time. Reduce Time and Cost: With this hot tub mineral stick, water will keep clear for long time, helpful to save your time and cost for keeping spa water in good quality. No Odor, More Nature Healthy Solution: No odor again than the ordinary ways to clean water, reduce skin reactions to harmful substance in water. Compatible use for inflatable spa or common spa, hot tub