Interesting thread, here is a video from Sweden on how it's done over here in case anyone is interested 
They show both the steps for vip and then the hydro
Price here in Sweden varies but I usually pay around 70 which is cheap, I've seen places closer to 100 per tank

They show both the steps for vip and then the hydro
Price here in Sweden varies but I usually pay around 70 which is cheap, I've seen places closer to 100 per tank
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