The largest public swimming pool of Amsterdam, located at the lake Sloterplas, in the West of Amsterdam.
On the grounds of the pool there is a recreation beach area along the lake (you can swim in the lake). The Sloterparkbad has several indoor and outdoor pools, including a 50 meter pool, suitable for international swimming events.
There are special opening hours for all kinds of special groups (women only, elderly people, families, etc.). If you want to make sure, you can give them a call.