Project Description

We are Boston's premier diving education center for Nitrox Blending Classes and other scuba lessons in Massachusetts and New England!

About The Course:


Have you ever wondered how your nitrox cylinders are filled? Do you like the “behind the scenes” look at what makes a dive happen? Take the Nitrox Gas Blender Course to find out how your cylinders get filled with nitrox! The Nitrox Gas Blender Course will take you through the blending of nitrox in an easy-to-understand format.

This course provides the training required to competently blend nitrox gas. The objective of this course is to train candidates in the proper techniques, equipment requirements and hazards involved in blending nitrox gasses for recreational scuba diving activities.

Who this course is for: Whether you’re a dive shop employee wanting to learn the proper procedures for nitrox gas blending or a diver interested in the process of nitrox blending procedures, this course will give you an in-depth, behind the scenes perspective on how your cylinder goes from empty to full of nitrox.

Students are required to hold a Visual Inspection Certification to participate in this program. The Gas Blender Course can always be combined with the Visual Inspection Course when needed.

First thing on the list is to Register and Pay. The course cost is  $199 PLUS TDI folder and materials. Once you've paid you'll have to register with TDI

*Note* This course only runs from May - October.
This is a one day course and is usually run along side our Cylinder Inspection/ 02 Cleaning course. Take some time now to familiarize yourself with the pre-class process and finish up all the necessary paperwork. You can use the tabs above to navigate through the pre-class procedures.  Remember, if you get stumped or if you have questions that aren't answered by the website you can always call (617) 277-2216 or shoot us an email at and we'll do our best to help!

Before Class

Note- All the paperwork you'll need, along with a what to do before class checklist is located at the bottom of this tab.

Pre-class intro and TDI Folder

Before you can start class you'll need to fill out some paperwork. Most of this can be done ahead of time, but some of it will have to be done in the shop. The only piece that MUST be completed at the shop is a folder provided by SSI. You will need to fill this particular folder out in the shop as we keep it for our records. You can do this before class - just remember to show up 30 minutes early if you haven't filled it out yet!


There are a couple of forms that can be done ahead of time. Most important is the medical. Go through the medical now and check to see if you need to answer "YES" to any of the questions. If so no big deal - you'll just need to get a doctors' sign-off before we can let you in the pool. The doctors' note is in the same file as the medical - Just scroll down to the next page. Remember IF you answer "YES" to anything in the medical it is COMPULSORY to get a doctors' note BEFORE getting in the pool.

Online form

The Next form you'll need to fill out can be found online and is strictly for our use - so we can get you signed up for the online training correctly. This page is at the bottom with the rest of the paperwork but is password protected. After paying online you will be emailed a receipt - within that same email, we have included a password so you can unlock the form and signup.

Online Training

After completing the form you will get an email signing you up for online training. The online training needs to be completed BEFORE coming to class. If you don't receive an email within 36 hours call the shop, and we'll make sure to unlock the training for you.




Check out the schedule below to make sure you can make it before signing up!


This is a classroom only course that consists of two sessions typically done in the same day. Classroom will be held at the shop (213 Boyston street, Brookline, Ma.)

Private Courses

Can't make any of the times scheduled? Sign up for a private, why don't you!

Private Pricing:

1 person $399 per person - $399 total 3 People $339 per person - $1017 total
2 People $369 per person | $738 total 4 People $299 per person| $1196 total


Much of the process is the same as normal classes, you'll pay in advance and fill out much of the same paperwork. We have made a slightly modified form which you can find below. You'll be emailed the password for this form as soon as you purchase the class!

You'll be doing all of your scheduling through Kim. She will be in contact as soon as you sign up for class to help schedule a session. If you have any questions before signing up feel free to send Kim an email directly at



What to do before class


As you may have guessed this course is very equipment intensive! There are various ways you can do this course - either with back-mount or side-mount (You should know and be comfortable with whichever rig you're planning on taking down), We offer rental gear for anything that you don't yet have or even complete packages that can be Nitrox ready. If you need any gear besides that listed below check out the rentals page

Searching Availability...


  • 18 Years or older
  • Certified or currently enrolled in Cylinder Inspection / Oxygen Service Course

What's Included:

  • 3 Hours of Blending Training
  • 2 apprenticeship sessions with experienced blending instructor
  • Minimum of 5 separate blends verified to within 1% of requested mix (cost of gas not included)

Buy It Here!