Ginger Ale Update

I have tweaked my previous recipe to make the ginger ale fizzier - it happened by accident, really. Here is the recipe, modified from Instructables:
1 cubic inch piece of ginger, micro-grated
juice of 1 lemon (1/4 cup bottled lemon juice - the stuff from Costco rocks!)
1/4 cup real maple syrup
2 tablespoons whey (whey from straining kefir makes it extra fizzy)
1/2 teaspoon sea salt
1 quart water
Mix all ingredients in a jar and let ferment for 3 days before sticking in the fridge. Strain before drinking.