Kraken does not support United States (US) domestic deposits or withdrawals via Automated Clearing House (ACH). ACH is an electronic network for financial transactions in the United States. If your bank advises you to make a bank transfer using ACH, you should not carry this out.
If you send funds using ACH, they will take roughly 5 business days to reach our bank and they will automatically be returned to you, which will take a another 5 business days. As such, attempting to deposit using ACH will result in significant delays.