Here’s the thing...several years ago I bought a used,banged up, 16 gal capacity (to the brim) aluminum kettle w/ lid for $40. What the heck. 3/16” thick, worth the elbow grease to clean it up and see what it was good for. Not inert like stainless, but I figured worth investigating. I’ve now brewed various ales and beers with this kettle, and nobody has noticed any sorts of off flavors or other negatives connected to aluminum. There’s no question that a proper SS kettle has superior “inertness”, but no problems here. Does anyone know of particular sorts of brews that will cross the line when prepared in aluminum and end up tasting “off”? Cheers!!