well i was using a fine grind and very dry material getting darker oil but it still tested at 70% thc...my system recovers the butane and i use 40 pounds of butane...(butane weighs 4.7 pounds a gallon) the oil is mainly used in making medibles.. as far as my system its much like everyone else except is food grade stainless and it's sealed..
well Tamisium just made some awesome improvements...if ya get one of their 2 ounce systems it's fun...