From <a href="http://www.SwimmingPoolSteve.com" target="_blank" rel="nofollow">http://www.SwimmingPoolSteve.com</a> lesson 2 in this leak detection tutorial series talks about a pool that loses more water when the pump is running vs. when the pump is turned off. This indicates the potential for a leak in the plumbing system.<br />...<br /><a href="https://www.youtube.com/watch?v=j8hy4JbjMsY" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=j8hy4JbjMsY</a>