I got mine at Air Liquide, they'll swap the bottle when you need a fill. This way you'll never have to worry about a hydro test and rust.
Get size 9 (13 lb.) Fill is $32.50. I get about a year out of it.
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Denis
150g SPS reef;3x250WHQI,Tunze Streams,Wavebox,Neptune Apex,fishroom in basement  ,reefing since 93,SPS since 99.
TOTM June 2010
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