When you register for an ongoing pool monthly or year membership you pay a registration fee with the first direct debit. This also applies if you have been a member before but do not have an active membership anymore or switch from a punchcard to a monthly/year membership. Your registration fee includes the activation of your membership account, set up of the monthly direct debit and your access tag.
The registration fee only applies for ongoing month and year memberships. It is not charged for other products or for memberships with a limited validity e.g. punchcard.