THE swimming pool at Huddersfield Sports Centre is "the dirtiest one I have ever used", says a surgeon.
This is despite £80,000 being spent on it this year, added Mohib Khan.
Essential maintenance at the pool saw it shut in January for new water tanks and filters to be fitted.
The pool, built in the early 1970s, had been criticised for being run-down and shabby.
But Royal Infirmary surgeon Mr Khan says he has seen little change in the water quality since the work.
The Edgerton surgeon swims at the baths up to four mornings a week before work.
"There is a continual problem with the cleanliness of the water. Sometimes it's OK, but other days it's not," he said. Insects, dirt and floating plastic all detract from enjoyment.
A spokeswoman for Kirklees Active Leisure, which runs the baths, said the water met rules laid down by the Pool Water Treatment Advisory Group.
She said a Kirklees Environmental Health team checked the pool monthly. Recent tests showed the floors, changing rooms and sauna area were exceptionally clean.
The water is checked at least three times a day.
The spokeswoman added that Mr Khan's complaint was isolated.