Place the celery, cucumber, apple, and ginger into the Vitamix.
Loosely pack in the kale then squirt the lemon juice in with the fruits and vegetables.
Pour in the filtered water.
Cover and blend on high for 1 minute or until all ingredients are blended and smooth.
Place a fine mesh strainer over a 4-cup glass measuring cup and pour the juice, pushing the pulp into the strainer. You want to squeeze out as much liquid as possible. I use a spoon to push the pulp into the strainer. Dump the leftover pulp into a bowl and then continue with the rest of the juice.
When the juice fills the measuring cup, pour the juice into glass mason jars or individual glass containers.
Continue until you have strained all of the juice. If you want to make more juice, then repeat the process.