We recommend usage of every other day, up to 3 times per week for the first two months for up to 30 minute sessions at a time. After the first two months, it is okay to dial down the sessions to twice per week thereafter. You'll notice that the colors of the foot bath aren't as pronounced over time, which is an indication that the detoxification is running its course. We also recommend replacing the array once per month if usage is at least 2 times per week. If using once per week, once every two months is sufficient.