​This is the 2nd most asked question I get after how much the actual ionic foot bath costs is how much its gonna cost each time. Some have a low cost of machine but a high cost of ownership. Always ask how much it costs per session but know that as the array ages, most people throw the arrays or rings out before the usage rating is up. If it says its good for 50 sessions but the bubbling and ion output is only half of a new array, then you having them tell you it costs 40 cents per session is not accurate unless you are actually gonna use the arrays when its only running at 10% capacity. Usually people put more salt than recommended and that wears out the arrays quicker so its really not 40 cents as they claim. Plus most people get only a 1/3 to 1/4 of the value of the treatment time as they don't wait 15 minutes to charge up the water and the initial 15 minutes of the soak they count that towards the 45 minutes session and most clinics I have been to use arrays that to the maximum rated session time on the manufacturers site. People are paying 35 dollars for a session for an array that has been used 30 times and the ion output is no where near the new state of the array and they are paying full price.

The problem with the arrays that have the larger surface area is that they don't last as long. Arrays with more ionization capacity don't last as long unless they are super thick and have less corrosive steel such as 316L certification type steel. 316L certified steel has no chromium in it. The metal is smelted in a heating process that filters the chromium out. Most spas have industrial grade steel, not medical grade certified steel.

The cost per session also goes up if the arrays aren't cleaned. Many people use vinagar and that can wear out the array faster. Some use CLR (Calcium Lime Rust) solution in the water and that cleans it. Some companies sell decalcification solution and overcharge for that too. Soem of the arrays are harder to clean and since rarely people clean them thoroughly, the arrays might never last the rated 50 sessions its rated for.  Not everyone wants to constantly brush their arrays after every use and just soaks them. Many people just rinse them in water due to laziness. Then people complain about why they aren't working like they did when new.
​ 
How long will the array last?
Depending upon water conditions, most arrays will last approximately their rated treatments prior to losing their conductive properties. Some practitioners have told us they have over 100 treatments on one array. NOTE: I believe that hwen the manufacturers rate their arrays for 100 sessions it is done under perfect controlled laberatory like conditions. Perfect low iron oxide himalyan salt. Distilled water. Cleaned as a whistle arrays (much longer than anyone has time to scrub them). Some sort of water conditioner. You get point!
OH, and AC power supply's slows down the electrolysis rate due due to back flow ripple of AC current mixing with DC current. This majorly slows the electrolysis process. An AC power source can enable the array to be used 50 times while the but with DC it would only last maybe 16 times. Even one volt of AC ripple can reduce the current. See my Voltage vs Amperage page and also my Ripple Effect page.

The time to know how much the sessions cost with the water you are using and the session times and the exact amount of salt each time is to count the times of sessions before you don't see anymore bubbles as the electromagnetic properties are depleted and the array should be replaced.

See my Array Types Page

Cost per session vs real or hidden costs
Have you ever heard of the electrolysis adsorbability ratio. There is. Formula that measures the rate at which a specific metal type dissolves in solution and in this case it is salt and highly charged water with a negative polarity field causing rapid electrolysis of the array. 

Basically how fast will the array type dissolve during a footpath sessions. 
Many of the Chinese manufacturers are known for providing false specifications with their arrays and measuring the electrolysis ratio without doing real world tests. Their main trick we believe is to a specific kind of salt with low iron oxide as well as to use the minimum amount of it required to produce ions from the array that way they technically producing electrolysis but with the minimum oxidation of the array and can then squeeze out the maximum amount of sessions. They also run the sessions in distiller water. 
In the real world depending on the amperage, the the power supply can handle most people use a teaspoon or more for their foot bath. But compared to the faux manufacturers tests don't be surprised if some of the he cheaper footpaths arrays only last for half the amount of sessions that are expected.

So which metals have the slowest electrolysis rate of degradation?
Stainless steel mainly. Most of the old school high end foot spa companies have experimented with various metals and after so many years it seems stainless site el it's the best. But not all stainless steel is created equal, I will only purchase a suitable grade of it which is for medical use, which means I make double sure the steel is certified 316L and not the same steel being used to build skyscrapers!

What is the cost per session once your arrays are midway 
The main cost per session is related to the array type and the raw material cost of the metal and the grade used.
For example using a hundred percent copper array is the cheapest of the metals and oxidizes quickly. Whenever I see those footbaths that are dark black and green that is usually the tell tale sign of a pure copper array.

The problem with the arrays that have the larger surface area is that they don't last as long. Arrays with more ionization capacity don't last as long unless they are super thick and have less corrosive steel such as 316L certification type steel. 316L certified steel has no chromium in it. The metal is smelted in a heating process that filters the chromium out. Most spas have industrial grade steel, not medical grade certified steel.


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