You may want to join an inventors club or sit down with a patent attorney to see what you need to do to protect yourself legally, and then contact the top 10 pool designers in your area or in the country to see if there is interest from a manufacturer's standpoint.
You may also want to test the idea with current pool owners to see if there is an interest from a direct and/or a retrofit standpoint. Regardless, make sure you are protected from a legal perspective before you start shopping your product around.
Often entrepreneurs don't have the core competencies to understand accounting, which could result in a startup failing. Here is how an entrepreneur should approach hiring an accountant or outsourcing her financial tasks to ensure success.