I am a private citizen not bound by gov procurement to requirements-only, and a pilot, so at Potomac I went with the Rolls Royce of fuel filters on the end of each dispenser.
Many airports may not have done so.
As I recall each filter housing was around $1,500 maybe 10 years ago, and we have four dispensers. That wasn't including the filters.
Because they have an easy visual check, and a simple drain valve should any water be present, we haven't had to touch them.
Again, many airports may not have wanted to drop nearly $10k on dispenser filters.
10300 Glen Way
Fort Washington, MD 20744