Is it still cold? and im sure it was saltwater when we went there in primary school and had 2 rescue a lump of plastic wearing pjs lol

It was salt water - I remember swimming lessons there in primary school. Had changing cubicles along the sides of the pool.

I learnt to swim there. It was the prefared place to learn as the salt water made you more boyant and so helped you to float.
There wre large pipes at the back of the building that filtered the sea water.