Wash and cut off both ends of the cucumbers. Pack them into a jar with some room left at the top.
Cut garlic cloves into 2-3 pieces, roughly cut up dill, slice up your horseradish root and add everything in the jar, including black pepper.
Dissolve 3 tbsp of salt in 6 cups(1.5 quarts) of filtered water and fill the jar. Make sure that cucumbers are covered completely in water.
Let the jar sit at room temperature, covered loosely with a cheesecloth or lid for 24 hours (cucumbers should be fully submerged. Refrigerate pickles afterwards. They are best served cold.