I have a 8x8 Calspa hot tub. I use Nature 2 and an ozonator. I shock it once a week with an over-sized 1/4 cup MPS and 2 teaspoons of dichlor. I use dichlor before and after each use. We use it in streaks sometimes going a 2+ weeks without use. I have done this for years and never had any water problems or health issues. The chlorine levels often go to zero, but I figured the Nature 2 and ozonator and weekly MPS/dichlor would keep it clean when not in use. It has been very low maintenance but is this risky? PS. Great board!