Lots of experience with gravity filtration. Works fine as long as you have plenty of time. Heat will speed the flow.

Immediately after my de water cycle I drain threw the filter. I set the bottom drain to trickle as not to overwhelm the filter outflow. I've even been brave enuf to walk away for a few hours.

That's it! simple and adiquate for my personal use. very easy and certainly a lot cheeper than pumps and filter housings.

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"