Jane Kovel replied with this information:
We have a 680 gallon hot tub that is almost 2 years old. We did tons of research about using non-chemical products in the hot tub. I found 30 pages of testimonials on the Pine Hill Group (yahoo groups). Here is what we do. When we fill the tub with fresh water we put in 5 drops of Geranium. That's it. We change the water 2-3 times a year. About once every 8 weeks or so we add 1-2 drops. We have a large garbage can with lid that we fill with water plus 1 cap Thieves household cleaner. My husband hoses down the filter with a high pressure hose and then soaks it overnight in the thieves/water mix. Then he hoses it down again and puts it in. We alternate with 2 filters. That is it. Our tub is always crystal clear, no scum, no slime, nothing.....just beautiful smelling clear, clean water. Hope this helps.Wow - that is so exciting to me, to think that you can use Geranium and Thieves Household Cleaner, instead of expensive, toxic chemicals.
I love the Thieves Household Cleaner! It has replaced almost every cleaner in my home, and I love the fact that I can clean and inhale without having to have the windows open, the fan on, and wondering how much toxicity I am breathing in. This cleaner offers a non-toxic, biodegradable, all-purpose cleansing solution using therapeutic-grade essential oils. It is fully biodegradable and complies with EPA standards.
Now, I'm ready to go to Jane's and get in her hot tub! :)
* This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.