The photos you see are of a similar tool with vacuum & filter bag setup.
The process is: filtered water is discharged back in the ocean and the filtered captured material then is disposed of.
To capture and dispose of marine growth we recommend the following
Attached is a photo of the discharge bag filter assembly
Filter bag is determined by micron size of debris
The most economical for your setup is to purchase tool with vacuum and filter bags
You can fabricate the filter bag support frame
Also, you can source the vacuum trash pump locally