by | Nov 3, 2019 | 10 comments

Oxygen tanks for ozone therapy at home is a popular oxygen source. Tanks are regarded as the best solution because of the high oxygen concentration of at least 99% and the low price. Compared to oxygen concentrators, oxygen tanks need to be refilled and regularly inspected. 

Medical professionals use only oxygen tanks for ozone therapy applications.

There are three types of oxygen tanks:

  • medical
  • industrial
  • pre-filled: those are only available at Promolife.

The pre-filled option is by far the best solution, in my opinion.



In world of ozone therapy pre-filled oxygen tanks which can be shipped are, as far as I know, a unique and novel solution solely offered by Promolife. They can be delivered anywhere within the contiguous USA. This is the best solution for anyone who wants nothing but the purest oxygen. Simply select the number of bottles, add to shopping card, use my discount code for 7% off, check out, and wait for the delivery. Voila! Done. No more running to doctors to ask for prescription, no more talking to sales personnel at welding shops, you just buy everything online. It couldn’t be more convenient.

The oxygen quality of pre-filled oxygen tanks is of 99.6% pure and ideal for ozone therapy applications.

You can chose between two different sizes and different number of bottles:

  • The smaller bottles hold 105 Liters of oxygen each and you can only order them in pairs. So the minimum order are two at combined US$ 224.95, or US$ 112.50 per bottle. If you return the bottles you will get a store credit of US$10 per bottle. The store credit is only for customers in the contiguous USA (meaning Alaska and Hawaii are excluded). You need a special regulator for the smaller bottles.


  • The bigger XL bottles hold 600 Liters each and cost US$ 295.00. They have a standard industrial CGA 540 valve which calls for the CGA 540 industrial regulator. There is no store credit for returned XL bottles. (Update Nov. 2019: the big bottles are out of stock)

O2Ready Prefilled Oxygen Tanks

Promolife’s O2Ready Prefilled Oxygen Tanks


Percentage of oxygen purity: 99.9%

Capacity: 116 L or 4.1 CF

Prescription needed? No

Good for all ozone applications including IV? Yes

What type of regulator needed? A special O2Ready regulator

How many Rectal Insufflations can be performed with 1 tank at 200 ml each? 525

Price: US$ 112.50 per tank or US$ 224.95 for 2 tanks (minimum order)

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O2Ready XL 600L Prefilled Oxygen Tank

Nov 2019 update: out of stock

Promolife’s O2Ready XL 600L Prefilled Oxygen Tank with CGA 540 valve


Percentage of oxygen purity: 99.9%

Capacity: 600 L or 21 CF

Prescription needed? No

Good for all ozone applications including IV? Yes

What type of regulator needed? CGA 540 pediatric regulator

How many Rectal Insufflations can be performed with 1 tank at 200 ml each? 3,000

Price: US$ 295.00

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Apart from the pre-filled tanks you can also buy medical or industrial oxygen tanks in order to perform ozone therapy at home. Both have pros and cons. Medical and industrial tanks have different valves. Medical valves have the number CGA 870, industrial tanks CGA 540.


Prescription needed? YesNo
Chain of custody? YesIt depends
Good for everything including injections?YesBetter use a filter
Oxygen purity99% or higher99% or higher
ValveCGA 870CGA 540
Materialmostly aluminummostly steel
A medical oxygen tank with a CGA 870 post valve

A CGA 870 medical oxygen tank. 

cga 870 pediatric regulator promolife

A CGA 540 industrial oxygen tank. 

cga 870 regulator promolife for oxygen tank

A CGA 870 pediatric regulator which fits CGA 870 medical oxygen tanks.


Medical oxygen tanks are equipped with a CGA 870 valve. This is important to know for two reasons: it determines whether you have a medical tank or not, and it tells you which type of regulator you need. Only a CGA 870 regulator fits a medical tank.

Medical oxygen tanks offer peace of mind when doing home ozone treatments since you know that they have been filled with the purest oxygen and that they have been handled in a traceable manner. A CGA 870 tank could never be accidentally filled with some other gas, since the only filling hose which fits a medical valve is one which transports oxygen. So a medical oxygen tank assures the highest quality and purity of oxygen. It can be used for any type of insufflation or injection including the intravenous route.

But: in order to obtain medical oxygen in the US, you will need a prescription from a doctor. If you do not have any respiratory conditions or other clear indications for supplemental oxygen, your doctor may not be willing to fill out the necessary paper work.

The main material most medical bottles are made of is aluminum, so they are relatively light weight and easy to carry. Larger medical tanks can be also steel.

cga 540 pediatric regulator

A CGA 540 pediatric regulator for a CGA 540 industrial tank.


Industrial oxygen tanks are equipped with a CGA 540 valve and hence call for a corresponding regulator.

As the name already makes it clear industrial oxygen tanks are used for industrial purposes like welding. They do not have to satisfy the same hygienic standards as medical oxygen tanks. They also do not have a chain of custody. If you buy your oxygen at a welding company your tank may be swapped for one which had been used at a car repair shop and not handled with as much care and caution as one used at a doctor’s office.

But, both industrial and medical oxygen tanks are filled with the same type of oxygen of at least 99% purity. For the above reasons, though, it is highly recommended to use at least one inline filter between the tank and the ozone generator. Best is to use a second filter between ozone generator and syringe or whatever other accessory you’re using.

Industrial oxygen can be freely purchased anywhere in the US at any gas delivery service. No special license or prescription needed.

Industrial tanks are mostly made of steel and tend to be heavier than aluminum tanks.

Many use industrial oxygen tanks for ozone therapy at home due to their low cost and easy availability. 


CGA 870 Medical D Oxygen Cylinder

A medical oxygen tank with a CGA 870 post valve

This is a 415 L medical oxygen tank with a CGA 870 post valve. It requires an oxygen wrench to open. 


Capacity: 415 L or 14.6 CF

Weight: 4.35 lbs

Material: Aluminum

Post or toggle? Toggle (no wrench needed) 

How many Rectal Insufflations can be performed with 1 tank at 200 ml each? 2,075

Prescription needed to fill it? Yes

CGA 870 Pediatric Regulator

A medical oxygen tank with a CGA 870 post valve

This is a CGA 870 pediatric regulator which allows for flows of down to 1/32 LPM. A regulator with very low oxygen flows is called pediatric. 


Material: Brass nickel

Wrench required? No

Flows: 1/32, 1/16, 1/8, 1/4, 1/2, 3/4, 1, 2, 3 LPM

Warranty: One year

Connector type: Barb

Price: US$ 79.95

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CGA 540 Industrial Oxygen Cylinder

A medical oxygen tank with a CGA 870 post valve

This is a 566 L (20 CF) industrial oxygen tank with a CGA 540 valve.


Capacity: 566 L or 20 CF

Weight: 13 lbs

Material: Steel

How many Rectal Insufflations can be performed with 1 tank at 200 ml each? 2,830

Prescription needed to fill it? No

Price: US$ 85.00

CGA 540 Pediatric Regulator

A medical oxygen tank with a CGA 870 post valve

This is a CGA 540 pediatric regulator which allows for flows of down to 1/32 LPM. A regulator with very low oxygen flows is called pediatric. 


Material: Brass nickel

Wrench required? Yes

Flows: 1/32, 1/16, 1/8, 1/4, 1/2, 3/4, 1, 2, 3 LPM

Warranty: One year

Connector type: Barb

Price: US$ 79.95

Sign up for my newsletter to get a code for 7% OFF. 


If for whatever reason you would not want to buy Promolife’s above mentioned pre-filled oxygen tanks, you may want to consider a few things.

New or used? I would always recommend to buy a new tank. Tanks need to be regularly inspected. When you buy a new tank, the inspection is already up to date. When you buy a used tank, you can not be sure if it has been properly maintained. It could contain impurities or it could have been mishandled, there is no way for you to verify. The valve could also have invisible damages or cracks due to age or mishandling. This could also be the case with new tanks but it’s less likely.

Put a sticker on your tank or mark it with a Sharpie. When you get it filled at your local welding shop, make sure you get the same tank back. This is how you maintain a chain of custody.

Capacity: Most people prefer a bigger tank over a smaller one. A big tank lasts longer and does not have to be refilled as often. Big oxygen tanks tend to be made of steel which makes them heavy and difficult to move. So be prepared to compromise.

But even a smaller tank can last you a long time. Unless you want to use it to make ozonated oil or sauna. Then you will use the oxygen up quickly.

In general, a tank of around 400L will likely last for a few months.

Toggle or post? The valve of a medical tank can have either a toggle or a straight post. A valve with a toggle means that there is a little metal handle attached to the top of the valve. By turning on the handle to the right or to the left one can open or close the valve. Tanks can also come without a toggle, just a straight post. In order to open a valve with a straight post one needs an extra key or oxygen wrench.

CGA medical oxygen tank toogle vs post valve

On the left you see a CGA 870 medical tank with a toggle valve. The toggle serves to easily open the valve. On the right you see a CGA 870 medical tank with a post valve. The post valve requires a wrench to open and close it.

How many RIs can you perform with a tank? Rectal insufflations are one of the most popular ozone applications. So, often people want to know how many of them they will be able to do with one tank filling.

If one takes one RI of 200 ml as the measure, then with a 400L tank one can perform up to 2,000 insufflations ( = 400L / 0.2L).

If you ozonate 2 glasses of water at 1/8 LPM for around 15 min, you will use up around 2 L of oxygen each time.

If you do VI at 1/16 LPM for 10 min, you will use up around 0.63 L of oxygen.

A 30 min ozone sauna at 1/2 LPM will use up around 15 L of oxygen.

Example: If you do per week 3 RI, 2 VI, and ozonate water twice a week, and do one ozone sauna per week, you will use per week around 21 L, in which case a 400 L tank will last for around 5 months.

Regulators: If you never handled an oxygen bottle you may wonder what a regulator is and what you need it for. An oxygen cylinder usually comes without any type of regulator. If you opened the tank without a regulator attached to it, the oxygen would escape within minutes because it comes out of a bottle at an extremely high rate. A regulator slows down the speed with which oxygen escapes from the oxygen tank and makes sure that that the gas flows out at a controlled, steady speed. 

The flow of oxygen is measured in Liters Per Minute, or LPM.

Ozone therapy with home ozone generators calls for very low flows of oxygen down to sometimes 1/32 LPM. This is the reason why only low flow pediatric regulators are used.

Pediatric means the regulators are designed for children’s needs. They typically have flows of 1/32, 1/16, 1/8, 1/4, 1/2 LPM. 

Every tank requires a matching regulator. A medical tank has a CGA 870 valve which calls for a CGA 870 regulator. An industrial tank with a CGA 540 valve calls for a CGA 540 regulator. None other will fit the tank.

When shopping for regulators you don’t necessarily want to go with the cheapest one. You want to make sure that the regulator delivers what it promises. As independent testing by a few of our members of the Facebook group “The Ozone Group” has demonstrated, the flow of the cheaper models can vary by up to 50%Promolife‘s and ozonatedoilonline‘s regulators seem to be the most precise ones.

Barb or DISS outlet? A barb outlet allows silicone tubing to be slipped on easily. A DISS outlet requires an additionalChristmas tree type adapter. Diss the DISS, choose a regulator with a barb outlet.

Barb vs. DISS outlet oxygen regulators

An oxygen regulator can come with a DISS or a barb outlet. Barb outlets are more practical. You can slip on a silicone tubing directly onto them. A DISS outlet would require an additional Christmas type adapter.


When you hold an oxygen tank at home, you hold an object under high pressure. Mishandling could lead to the cylinder turning into a missile and cause damage to humans and property. It is therefore of utmost importance that you secure your oxygen tank. Either keep it in a cart or bolt it to a wall. Keep it away from heat sources, open fire, and children.

Oxygen tank with cart
wall bracket oxygen tank

Paola Dziwetzki, NP

I’m Paola, aka the Crazy Old Ozone Lady. I help people use ozone therapy in the most effective way. I have used ozone and diet to successfully treat psoriasis, joint pain, chronic fatigue, a low immune system, herpes infections, and a few other conditions.
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Legal Disclaimer

Information provided is for informational purposes only and is not a substitute for professional medical advice. No health claims for these products or diagnostic tools have been evaluated by the United States Food and Drug Administration (FDA), nor has the FDA nor any other medical authority approved these products to diagnose, cure, or prevent disease. Since every person is unique, we highly recommend you to consult with your licensed health care practitioner about the use of ozone products in your particular situation. Neither The Power of Ozone nor the manufacturers of these items are responsible for the misuse of this equipment. It is highly advised to receive professional council from a licensed doctor before using Ozone Therapy or any of the mentioned products or tests on yourself.

Except for the Ozonette, none of the ozone generators presented on this website have been approved for medical purposes. Any application of the machines for other than water purification is at the sole risk of the user.


  1. Sherry

    I just spoke with the person who owns a welding company and he said the medical oxygen and welding oxygen is exactly the same. Their tanks are all steel.
    Can you use steel tanks for ozone therapy or does it have to be aluminum?

    • paola d

      Hi Sherry,
      yes, you can use steel tanks for ozone therapy. Just make sure that it the valve and the regulator match.

  2. Chris Crane

    Paola: What does it cost to get a tank refilled with industrial oxygen? I would assume that it is less than $87.50 (which is the cost of a promolife filled tank if the tank is returned for credit).

    • paola d

      Hi Chris,

      back in my days it cost around $20 to get a 20 CF tank filled in NYC.
      Oxygen is cheap. I can imagine it’s not much more now.
      The benefit of the prefilled tanks is that you’ll get it shipped to your home. You don’t need to deal with the gas shop, answering their questions, etc.


  3. Vital

    Guten Tag Paola,

    As I (a German Swiss) am living mostly in Europe – I do not have a permanent residence (yet) – can you give me some advice about which and where I would best buy an (as small as possible) industrial oxygen tank and possibly adapter(s) to refill them in different countries?

    Many thanks in advance!


    • paola d

      Hi Vital,

      you can buy filled medical oxygen tanks in many parts of Europe, as in Germany and Netherlands, and in other countries. You don’t need industrial oxygen and you don’t need a license, just access to the internet. Same with the regulators.


  4. Vital

    A license may not be required to buy a medical tank, but isn’t a prescription required to get it refilled?

    • paola d


  5. Davide Bianchini

    Thank you for your very helpful advice. I have a question about the tanks. My mother has COPD and is on oxygen, so we have medical grade tanks, condenser, and filler (which allows me to fill the tanks at home using our condenser). My question is, when I fill our tanks using our condenser, will the purity of the oxygen in our tanks be better than the purity from the condenser? And also will it be suitable for MAH use? Thanks!

    • Paola Dziwetzki

      Hi Davide,

      yes, the purity will be likely better, I think it’s around 95%, but less than if you bought the tanks or had them refilled at a gas supplier.

      I would contact the manufacturer of your equipment and ask them before doing MAH with that oxygen, but I tend to not recommend using it for MAH.



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