Nature 2 mineral stick for hot tub spas works with all chlorine based spas.
The nature 2 spa stick is easy to use. When buying one, start with fresh water and then remove filter. It should be placed about an inch from the bottom of the filter. Just place it in the filter hole in the middle of the filter. The Nature2 Spa Purifier can really reduce the amount of chlorine you need. Be sure the pump is off on the spa before attempting to remove the filter. Just make sure it does not go down into the suction line. Shock the spa after installing the Nature2 stick and enjoy mineral sanitizing of your water.