Opened to a slimy pool:(

[docsobeck]

the reason your FC is staying low is that you're adding bleach a gallon at a time. that's not even close to what you need for initial shocking of a pool that size with algae. i opened yesterday to the same sight, and i put in ten gallons last night, and it wasn't nearly enough. (18,000 gallon IG) i still have some green today. tonight i plan to put in 15 gallons or so. a very simple rule of thumb that i've used with pretty good success is shock at night and if your FC is down well below shock level the next morning, say around 1.5 PPM, shock again that night with 1.5 times as much as you used the night before. you have to keep shocking until the FC is close to shock level in the morning - if not, it means there's still a lot of living stuff in there using up the FC.