We are changing the liner in our pool within the next few weeks and I need to know the best way to handle chlorination during the refill period. The pool is around 25,000 gallons and it should take about 40-50 hours to fill with the hose based on the top off I gave it after the winter. The tap water tests at around 2 ppm FC but with no CYA that will be gone quick. The weather is finally getting consistently warm here with temperatures in the lower to mid 80's. The pool is in the sun all day. Should I worry about it getting algae started in the two days it will be filling without the pump running/no bleach added/no CYA? Should I add CYA maybe pre-dissolved to help stabilize the chlorine during the refill and add bleach also? I dont want this thing to have a chance to turn green.