I have to get the daylight into the pool every day to make it work, ie. whether I need to tow roofing every day?

You should allow daylight to penetrate the pool if you have applied FN®AQUA ideally for 3-5 hours. Ideally apply in the morning and have the filtration turned off. As soon as you start the filtration and the pool is separated you no longer need to get the daylight into the pools.