An improved process for recovery of liquefied petroleum gas from a raw natural gas feed stream, capable of achieving ultra high propane recovery yields, thereby separating substantially all of the propane and heavier hydrocarbon components from a predominantly methane and ethane feed gas stream. In a vertical compression embodiment, a lid has an integral press element that compresses the tea bag against a tea bag support means in the bottom of the container upon applying pressure to the lid. When the manual key of the TRANSFER INTENSITY is set to the right side, the printer CPU increases stepwise the transfer biases in accordance with the setting. Methods of foam control, backwashing and chemical cleaning are described.