Sandra
You can't fill up your tank with gas for 15 dollars these days.
I look upon the expenditure as cost-effective if it saves me from doing IV chelation at about 75.00$ US an occurence or various types of SRT chelation( see www.clarus.com ) .
If I amortize the cost over a couple of years and if it allows me to detox at my own rate and when I want to , then it is well worth the expense.

I will keep the site posted on how it seems to work.