Hi I live in a rural area. I wanted to fill some cylinders today but decided against it as the Farmers have been spreading manure on all the fields. I gather rotting cow muck gives off Hydrogen Sulphide, Carbon Dioxide, Methane and Ammonia. I just wonder if, this is filtered by the compressor filter and personal filter or, if I need to be concerned about these goig through the Compressor and into my Cylinders. I don't want to be breathing these gases in concentration when at depth. So, what are your opinions please. This is not a joke it is a serious query.