Scheduled Classes are 2 evenings during the week (last Monday & Wednesday of each month) from 6:30-9:30 pm or Saturday from 8:00 am till 3:00 pm.  We also provide training at your location for private groups.  Call for rates.


Cost $199.00
Price includes courseware, not included equipment, rentals, fills or fees (boat or quarry)

Receive a $10.00 Gift Cert for On-Line Registration

*Includes instruction, text/workbook, handouts and 10% Off Gear for One Year Special.
Click here for our current schedule!

Click here to print this brochure from a PDF

If you have a group of 2 or more, we can set up a call to fit your schedule!

What is "Enriched Air" Nitrox?

We are hearing a lot about enriched air or Nitrox these days.  But, what is it? Simply speaking, enriched air is air with additional oxygen (or reduced nitrogen).  Air, as you know from your open water course, is made up of Oxygen (21%) and Nitrogen (79%).  If you take air and either add oxygen or remove some of the nitrogen you have what is being called "enriched air" or "enriched air Nitrox".   Since the amount of nitrogen in the gas is reduced, it is safer air.

Why use Nitrox?

Divers find that they enjoy the extra time it allows them at depth; still others report that after a day of diving with nitrox they feel better and more energetic than they do after diving with air.  Nitrox allows you more bottom time because it has less nitrogen.  The extra bottom time is especially welcome in mid-depth ranges and when making more than one dive a day.  Many resort locations are making nitrox available to divers certified in its use.  We can now stretch our under-water vacation time and have less fatigue.

Isn't Nitrox only for deep dives?

Nitrox is definitely not for deep dives.  Its greatest use is for diving at moderate depths.  In fact, enriched air cannot be used for deep diving because the higher oxygen content can be toxic at depth. This is its major limitation.  A large part of nitrox dive training is spent learning how to safely cope with this restriction.

What certification is required to use Nitrox?

NAUI or T.D.I. Nitrox certification or the equivalent.  The T.D.I. specialty course is designed to teach you the procedures for safe, recreational non-decompression diving with nitrox. 

Can existing Scuba equipment be used with Nitrox?

Yes.  Tanks only need to be specially marked only when filled with nitrox.  This label also indicates the depth limit and other information.

Do I have to have my tanks Oxygen cleaned?

That depends upon the method that the dive center uses for filling tanks.  Some dive centers require that tanks be oxygen cleaned annually when used with nitrox, due to the tank filing methods which they use.  At The Illinois Institute of Diving we can fill almost any tank with nitrox!

Are Nitrox fills expensive?

Nitrox fills are slightly more expensive than air fills, but the total cost is less per minute because of expanded no decompression time and shorter surface intervals.

The Illinois Institute of Diving
245 W Roosevelt Rd, Building 2 Suite 8, West Chicago, Il 60185
800-How-Dive (469-3483) ~ 630-469-3483 Fax 630-469-3491
Map to IID Dive Center
Open: Monday thru Friday 11:00 am - 7:00pm Saturday 9:00 am - 5:00pm ~ Sunday by appointment ~ email

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