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I have been using this stick for years and it does a great job of keeping my spa clean and chemicals less maintenance. The one time I did not use it I had all kinds of black flakes in my pipes when I drained it, never again.
My wife and I really like the results of using Nature2 Sanitizer. We just starting using it. So we don't have a lot of experience yet.
2nd time ordering and both times came in paper bag packaging and box inside completely crushed. Item appears undamaged and worked but kinda wonder if got lucky.
Our water chem tends to stay balanced longer when I use these and I use less shock and bromine so the water is less drying to our skin.
I tried other name brands, and these work the best.
Due to counterfeits, I only buy from here.