Earlier quoted context omitted.
Most rockets don't have fuel filters, but this requires their tanks to be kept in a much more strict state of cleanliness, and any failure to do so would result in mission failures. SpaceX has long had a very different idea about FOD than most other rocket companies, famously Merlin engine qualification testing contains ingesting stainless steel nuts.
That's bonkers. What size nuts do they pass through their engine? Every engine before it goes to space has to have a nut passed through the system? Like a 12mm "go into space" grade nut or a little itty bitty nut like I might find holding down a heat sink assembly in a 1998 vintage motherboard? I'm off to the googles to find videos...
The tradition of passing nuts comes at least from the history of developing engines for Soviet Moon launcher, N-1. The engines used on all four launches, NK-15, were notoriously unreliable, and the suspicion was that their turbopumps, having quite tight clearances, sometimes had rotors touching walls during work. In oxygen-rich environment that led to engine fire. The engine which fixed those problems, NK-33, was working much better, and to demonstrate that it's robust for the problems like turbine misalignment, some metal parts, like nuts, were intentionally dropped into the propellant flow.