June 17th is International Natural Pool Day.

In this context, the International Organization of Biologically Treated Swimming Pools (IOB) organizes a photo contest of great moments next to a biological swimming pool in the last 12 months.

You can share your best moment of last year with other fans of biological pools. In the week of June 9th to 16th, 2023, upload on IOB website a photo corresponding to your best moment by the biological pool.

Those who participate can win! A jury of experts will choose the best photos of good times by the biological pool. Each photographer of the 3 photos chosen by the jury will win a t-shirt designed by the Colombian artist SOMA.


If there are contributes from Portugal amongst the 3 chosen winners, Bio Piscinas Lda. will honor them with a surprise!