We are building a 45' x 20' rectangular pool plus a sundeck that is about 12' × 4' (total guestimate on sundeck). Depths will graduate to 7' deep. Water features include bubblers in sundeck and ledge type waterfall...no hot tub or spa. We are in excavation stage now. Would appreciate greatly any advice!!! We live in South Texas & have extremely hard water. Any suggestions on pool equipment, safety devices, convenience must haves, you name it I need advice . Thanks!!!