Struggling to Keep at Shock Level

[day1]

You kinda have a catch 22 going on here...cant' keep Cl up enough to kill algae because of 0 stabilizer, but need stabilizer to maintain Cl levels up. I have about the same size pool...18 x 34 but no deep end. You need stabilizer first off. Get a large size container at home depot/walmart (4lbs.) and pour fill a couple big tube socks, or panty hoses with it and hang in pool. I do mine by return jet and off steps. Then put remaining in skimmer with pump on...and DON'T backwash filter for at least a week. Test for CYA in 5-7 days and you should see your chlorine levels start to balance. Shoot for 30-50 ppm of CYA. As far as the algae on sides, more chlorine and scrubbing is probably all you can do. Too late for algaecide once bloom takes over, but get some polyquat for future proactive needs. Don't worry about any other #'s except cl, pH and CYA for now.

I know Bleach=Cl said not to add cya yet, but I'd go ahead and start getting it into water since it takes a good week to dissolve fully and be readable-- by that time you should have algae killed if you shock properly. You could probably use pucks if you have any since they have CL and stabilizer in them...kill 2 birds with one stone since you need both fast. In the meantime, I'd be in the pool with a scotchbrite pad or something to loosen algae. Most liners are pretty resilient to scrubbing--just go easy and don't use a wire brush!!