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I searched and nothing similar to this.

Filter block filter of course.The filter blocks let in the mini cubes, water and lava.
This allows for easier water traps.
Example below:












Furnace=Filter Block
The Filter blocks stop the zombie from going down so zombie drowns.The droppings fall through the filters ready to be collected.

This is how to craft it:
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This makes a quarter of a filter.

Craft it four times and put them together like this:
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[] [] []
Cobblestone=quarter of a filter.

This is the finished product and will be ready to be placed.
The filter only lets stuff through vertically.

can a mob drown in the first place?

Quote from Zoythrus »

can a mob drown in the first place?

Yes