One of the reasons I dislike dive shops is because I find that most of them are generally clueless and overpriced.
The shop right down the road from me will fill my double Al80s for $12 with "regular" air but it's $14 if I want O2 clean air. Why are they even pumping something that isn't O2 clean if they have the ability to do otherwise?
It depends on how their fill station is set up. My compressor and normal filters pumped air that tested to modified grade-E standards "O2 compatable". However, should a filter or the developes a problem that could change and I might not know. When I needed modified grade-E air, I ran it through a hyper filter. That thing wasn't cheap and there was a built in flow restrictor and filling was necessarily very slow.
I don't think I ever charged extra for air but rather rolled the extra cost into the cost of a nitrox fill.
If I want nitrox, watch out...stuff is $$$$. They also require nitrox wraps to fill your tanks with nitrox.
Some shops are clueless, however, this is another one of those things that can be comming from the agency. For instance, if I remember right, IANTD facility standards require a shop to use the tank marking that they specify.
I don't remember that being a PADI requirement but...the nitroc course clearly states what marking "should" be on a tank and a shop who has only had that training is likely to require those markings.
Either way, this nitrox wrap thing needs to be adressed at the agency level.
Another hangup I have is that most dive shops treat their customers as if they're stupid, and they make me play their stupid games to get what I want. :no Whatever happened to "The customer is always right." ??
Sometimes the shop is wrong but whoever said "the customer is always right" was an idiot. Customers are often wrong, however, you have to make them happy in order to make money. Whether they are right or wrong just doesn't matter much.
I am the customer. I am paying you money.
I know you feel that way but depending on where you are, you may not be doing them the favor you think by buying air there.
In my shop there was no way I could make a profit selling air. I just didn't sell enough of it. The only reason I even had a compressor was because in order to call yourself a dive shop PADI requires you to provide air AND I needed it to teach classes in the pool.
I figured it out once that with the amount of money I had in my fill station, lab costs and filter costs and the amount of air that I pumped in the time I had my shop that every AL 80 I filled cost me like $25 or something rediculouse like that...I charged $5. All the tanks that I filled for classes (the bulk of the compressor hours), were included with the class...that I was already losing money on. The fill station was essentially just part of the cost of teaching.
Since it was so vitally important to me to have that compressor running for classes, I always prefered it if our divers got their fills at the dive site so I could keep the hours off my machine. The outfit that service our compressor was 5 hours away and they charge $60/hour from the time they left their shop. In other words it cost me $600 just to get them there. That is 120 fills just to pay for the service technicians driving time. That was for a repair that wasn't scheduled. Scheduled servicing was done when they were in the area and I didn't have to pay that trip charge then. Not to mention the fact that they all want to come in 5 minutes before you close on a Friday night to get air for Sat morning. There is NO money in any of that.
Why did I pay someone else service the machine? Traceability. If my air would have hurt someone, I would have been able to easily show that I had everything done that I was supposed to have done and that it was done by someone who is qualified to do it.
This is an interesting topic and I keep reading that dive shops MUST be making money on gas but it just isn't true. In order to make money on it, you need enough sales volume. Even then, you need a machine that can handle the peak demand. My compressor and banks were more than big enough for the amount of air I pumped and too expensive to ever pay for with air sales. However, if my wife was filling student tanks in the afternoon and a bunch of people walked in for fills, I essentially had to pump the whole weeks worth of gas in one day. The peak demand is too much, you run the banks down and then things get slow and there is no way to get paid for that time AND the people who have to wait get mad. A bigger system solves the demand issue but then you need that volume all the time in order to pay for it.
LOL, anyway noone who ever baught air from me was doing me any kind of favor unless they baught a BS or something while they waited for the fill.