Here's the short of it: You can use gelatin to filter cruddy used deep-frying oil until it is crystal clear. The technique is easier than any other method I know, requiring no wire strainers or coffee filters or extensive clean-up.
How to Deep Fry With Confidence
How To Make a Layered Jello Mold
Best Oil for Frying: How to Clean Deep Fryer Oil & More
FryAway Deep Fry Cooking Oil Solidifier, Solidifies up
How to reuse (and eventually discard) your frying oil
The Genius Way To Clean Used Frying Oil That You Never Knew About
Chef John Ash on how to make tempura at home
How to Gelatin-Clarify Oil – Carter Family Recipes
The Best Homemade Real Fruit Juice Jelly Candy Recipe
DIY Natural Gelatin Hair Gel - Frugal and Easy! – My Merry Messy Life
Broken Glass Jello - Belly Full
The Genius Way To Clean Used Frying Oil That You Never Knew About
British Strawberry Jelly (Jell-O) - my Hungry Traveler