There's a reason why this company is called Optimum. Based upon their product line and willingness to LISTEN and assist, they rank high. They feature some of the most powerful ionic foot bath machines on the market, running from 3 to 5.5 amps---all manufactured in the USA. Since these units run on higher amps, Optimum claims that they are able to generate up to 35 times more negative ions than their competitors. Greater ionization, in theory, will produce an increased detoxification effect.

With the Optimum units you have full control over the amperage simply by adjusting the current knob (going as low as 0.00 to 5.50 amps). Many of their competitors do not have this adjustable feature and lack the amperage. Their water module offers advanced surface design to enhance the ionic osmosis process; welded connections for stronger conductivity and use 100% copper construction. This is a great feature since it doesn’t require cumbersome manual replacement of individual components (the entire unit is disposable). They even offer a unique copper tub that adds conductivity to the footbath, which translates to less current being added to increase amperage being required and which ultimately helps to extend the life of the Optimizer water module. 

Well thought out features here. Since Optimum puts "more" into their design and construction, their units tend to be a bit more expensive. You get what you pay for!

Optimium sells 3 models....essentially, one for home use and two professional grades
Optimum Focus ES 1500i: Home Standard 3 amps

One Person-Individual Use
Optimum Focus ES 8000i: Professional Single 5.5 amps

One Person-Professional Use
Optimum Focus ES 9800i: Professional Dual 5.5 amps

Two Person- Professional Use 
Questions you "should" know the answers to before choosing an ionic foot bath.

These questions have no hidden agendas and are designed to help you along in your quest. Your information will never be sold or shared with anyone that does not work with us. 
information submitted is not shared with anyone else. My primary objective is to help you pick an ionic foot spa based on your needs, not sales hype.

If you don't know the answer to a question, leave it blank.
How many people will be using the spa per day?
I have used an ionic foot bath product before.
How many amps are you looking for?
How many volts are you looking for
Ion Output:
For a cheaper price, I am willing to sacrifice:
I prefer my ionic foot spa made:
What is more important?
Array Cost: I prefer to pay:
Are you concerned pulling toxins out from body fat?
Warranty:
If I can get it cheaper, I can sacrifice the warranty:
What is more important?
I'm interested in a foot spa to improve
Is your tongue white in the morning?
Are you water absorbent?
What type of water are you going to be using?
What city are you using the spa. This is for me to look up your water type.
Do you want a single or dual capacity foot spa?
Are you a health professional?
What price range fits your budget?
Which models or brands were you comparing?
How long have you had health issues, if any?
What are you doing previously before an ionic footspa for any reasons you need a spa?
Which brand and model were you interested in?
Before using the spa, I will
Name
Email
Phone Number
Please include comments so it's easier to help you.
What else should I know about you in order to give you the most accurate evaluation?
Do you have a lot of foot perspiration?
Are you friends with my ex business partner?
Can you tell that I have ADHD by my site?
Do you have Dowager's Hump?
Is cleaning time important to you?
What ripple standard do you want?
What strength pulling power do you want?
Which brand interests you the most?
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...because I had to buy five ionic foot baths till I found the highest pulling power