I think it was just a 20€ deposit for pool towels
We didnt hire from hotel.We bought a towel for 10 euros a large, one smaller ones are 7 euros,all shops are same price.
I never hired towels I took my own.
It maybe full most of the time round the main pool on the sun loungers but there is another smaller pool in the middle of the hotel complex which is lovely and quiet and your always able to get a sun lounger there.
We didn't hire any towels as we brought our own . To be honest of if ur not willing to be up first thing and get a sun lounger there's no way ul need towels as u won't get a sunlounger . I think out of the 7 nights we where there we managed to get sun loungers twice x
Get an answer from Bahia del Sol Hotel staff and past guests.