water
Also this system could be as simple as 4" black pipe runs hanging on the side of your green house wall. the bottom pipe is your water source and the gas rises up the pipes that are on slight up bubbles or angles connecting to the next pipe. Then the top pipe is angled down so that water flows down into you tank when it turns back to water droplets. you could use your tank water and run it around or on the top of the pipe to help condensation form. Or you may just go with a filter but if some one that cant afford or get access to a filter system and there is lots of sun light its easy to get around.
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