The Pool at Hyatt Regency Koln
The pool at Hyatt Regency Cologne is praised by travel writers. Of the 6 reviews tracked on TripExpert, 2 referenced the pool, including Oyster and Star Service.
Hyatt Regency Koln 
Oyster
Star Service
Oyster "The hotel has a main restaurant and a bar with a terrace, as well as an indoor pool, a spa where guests can get free massages, and plenty of meeting and event space"
Star Service "No second thought, the facilities include an indoor pool, gym, sauna, solarium and whirlpool"
