Cook the rotini pasta according to package instructions until al dente. Drain and cool.
In a large bowl, combine the cooled pasta with diced dill pickles.
Add diced red bell pepper and chopped red onion.
In a separate bowl, mix mayonnaise, dill pickle juice, and garlic powder.
Pour the dressing over the pasta mixture and toss gently to combine.
Stir in fresh dill and season with salt and pepper to taste.
Cover and refrigerate for at least 30 minutes.
Before serving, give the salad another quick toss.
Serve chilled.