There are alternative methods for treating rabbit pelts without using aluminum sulfate. Aluminum sulfate is commonly used in the process of tanning rabbit pelts to remove hair and flesh from the skin. However, if you prefer to avoid using this chemical, there are other natural alternatives available. Here are a couple of options:

1. Vinegar: White vinegar can be used as a substitute for aluminum sulfate. It helps in loosening the hair and flesh from the rabbit pelts. Dilute vinegar with water and soak the pelts in the mixture for a few hours or overnight. Afterward, remove the hair and flesh from the skin.

2. Citric acid: Citric acid, derived from citrus fruits, can also be used as an alternative. Create a solution by dissolving citric acid crystals in water and soak the pelts in this mixture. It will help break down the hair and flesh, making them easier to remove.

Both vinegar and citric acid can be effective alternatives to aluminum sulfate. However, keep in mind that the results may vary, and it's essential to follow the instructions carefully when using any alternative method for treating rabbit pelts.