Well, seeing you're in Austria, I don't know how popular swimming is there. Since I live in Florida, swimming is a MAJOR thing here. Kids grow up in the water here. Plus it doesn't snow here, so you can basically swim year round outside. But I don't know how it is like in your area. If swimming a really popular thing, you'll probably have a steady business, especially if it's indoors. But if swimming is not practiced at all in the winter, you're going to have to figure out something to do in that part of the year. 40€ does seem a lot too me. Personally, I would charge 10€ per person. Maybe 15€ but anything over 20 would be very pricey for a one day swim.
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