My concrete pool(6 months) is showing some open pores at the bottom of the surface. I have been diligent with the application of chemicals, clorox and ph balance. Am I missing something. Also, what should the increment in my electric bill be on a 14x26 aprox. 10,000 gallon pool with a 2hp hayward pump running for 4 hrs. daily, considering 2 sam lights which I occasionally turn on. Thanks?