Security camera footage is set to reveal the person who deliberately defecated in the Middlemarch Swimming Pool, forcing it to close.
Middlemarch Swimming Club president Stephanie Macaulay said the pool was closed for cleaning after three "faeces incidents" in a week.
The final incident was a "deliberate attack" and was disappointing, Mrs Macaulay said.
The covered indoor pool, 23m long and 10m wide, on the grounds of Middlemarch School was "well used" and about 60 families owned a key to the facility. Casual users could hire a key to access the pool for a day, she said.
A person defecated on a concrete area on the side of the pool on January 21.