Tell me if this sounds right. I have 10 tanks total. 5 steel (nitrox), 3 alum 80 (nitrox), 1 alum 63, and 1 alum pony (nitrox) that all need Hydros. I asked a LDS how much to get these hydro and he gave me the standard $47 for the Hydro/vip/air fill but then he told me that my nitrox tanks would need to be o2 cleaned again at a price of $30 each because the valves get removed
. That is $77 for the already o2 cleaned tanks each. When I asked him why the tanks needed to get o2 cleaned again and if the valves also needed to get o2 cleaned, he told me that any time you take the valves off, the tank and valve has to get o2 cleaned again because of impurities in the air.
Is this right? I don't recall this being the practice as of 5 years ago when I had the tanks hydro'd last.