Pool signs

I doubt that these signs are a legal requirement for a private pool. Most of the ones I've seen are more about what is socially acceptable behaviour rather than healthy and safety issues.
From an insurance point of view then you might want to cover yourself by ensuring that the pool has the depths marked clearly, so that people know not to dive into the shallow end, and that any areas that are slippery when wet are signposted.
From a pool maintenance perspective then you might want to encourage people to shower before getting in, and not to pee in the pool (that should be an interesting pictogram!).

If you do need signs then I'm sure Graeme at Canal Print will be able to sort you out http://www.canalprint.com

Pete.

Also, your community administrators (if you have one) will know where to get them.