The Pool at Patong Merlin Hotel
Patong Merlin Hotel's pool is recommended by professional reviewers. Out of 2 publications tracked on TripExpert, 2 endorsed the pool, such as Frommer's and Oyster.
Patong Merlin Hotel 
Frommer's
Oyster
Frommer's "Both facilities also offer stunning lagoon-style swimming pools, each with a pool bar, and some rooms even have private "swim-up" access"
Oyster "With multiple pools and restaurants, meeting rooms, a full-service spa, and a kids' club, the Patong Merlin draws mainly couples and families"
