Industrial filter purging unit.
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Previously:
https://www.homemadetools.net/forum/...466#post181890
https://www.homemadetools.net/forum/...863#post190791
https://www.homemadetools.net/forum/...842#post186778
https://www.homemadetools.net/forum/...rs-video-83964
https://www.homemadetools.net/forum/...068#post164793
