Cleaning dpf with water??

[Magard]

https://www.arrowtruck.com/blog/2016/06/...ilter-dpf/
A interesting article that gives a run down on the filters and the catalyst coating on them and it’s function. I’ve researched this off and on today. This is the only article I could find that even mentions the catalyst of precious metals on the filter.
Also I notice a smaller filter in front of a larger filter. Is this like a catalytic converter in front of the dpf. Maybe it helps keep the dpf hot enough? Just trying to fully understand this system.