All aircraft fuel tanks should have a finger filter to prevent the outlet becoming blocked by a "gumnut"
Having coarse filters before a fine, 70 micron, filter will do nothing to reduce the risk of the fine filter blocking in the very rare event the tank becomes contaminated by fine gunk. The ACS filter does not have a huge surface area with that single flat disc strainer, however it will capture all those course items and keep them in the bottom of the gascolator for your viewing pleasure, unless one of those course items causes the drain to not shut off and you suffer fuel exhaustion due to lost fuel. (Thinking about the recent jabiru in the top end).