Yes, you can start your swg. The filter pressure is probably going up to filter out what the chlorine is breaking down - the citric acid. You can start to raise the chlorine level - keep your ph no higher than 7.2, and watch for stains - if you start to see them, bring your ph back down to 7 and add more sequestering agent. I usually try to raise my chlorine by 1 ppm at a time till I get it to where it needs to be according to cya. You will find it hard to keep chlorine in the pool till all the cloudiness is gone.