What is flash chilled coffee?
It's coffee brewed hot, then chilled immediately over ice. The hot water pulls out the acidity and fruit that cold water leaves behind, and the ice locks the cup in before those flavors start to dull. Cold brew is smoother and rounder. Flash chilled is brighter and tastes more like the coffee itself.
Why pour it through a filter after pressing?
A French press lets fine grounds through, and those grounds keep extracting while the coffee sits. Running it through a paper filter catches them, which keeps the cup clean and stops it from turning bitter as it chills. If you don't have a filter, just move the coffee out of the press into another container so it stops brewing on the grounds.
Can I use a different coffee?
You can, but a light roast is what makes this method worth it. Slip & Slide is roasted light and leans strawberry, lime, and fudge, so the fruit really shows up when you pour it over ice. A dark roast will come through flatter and more bitter.