So after the season ends, they have a special set of swims for dogs and owners, by ticket only, before the pool is drained and deep cleaned?
What a nice idea. And I say that as someone who wouldn't like sharing a pool with loads of other people's dogs, either.
I really hope the people freaking out never swim in beaches around the UK. Or at least if they do, never read up on the cleanliness of those waters. A mildly chlorinated outside pool is going to be a LOT cleaner than seawater around many British estuaries.