I can't help with the popup system question. Hopefully someone else will come along who can. If you can't get it to work, then you will have to buy some other type of vacuum system to use.

Keep adding bleach. As many times per day as you can, test and take the chlorine back up. The more consistently you can do this, the faster you'll clear the pool.

Chlorine does not evaporate. The reason your level is low so soon after adding it is because 1) you have a low CYA reading and 2) it is being used up fighting algae which is what you want.

Bleach, bleach, bleach. Lots of bleach.