Hello, and welcome to the forum!!
Liquid chlorine (aka bleach) gets a bad rap from the pool store folks that want you to buy the more expensive stuff from them, but it's actually what almost all of us use. Keep in mind that chlorine is chlorine is chlorine once you get it into the pool--the only difference is what else is added to your water. Cal-hypo adds chlorine + calcium, dichlor and trichlor adds chlorine + acid + stabilizer, and bleach adds chlorine + salt water. So..once you get the other levels where you want them, liquid chlorine is often the easiest, and cheapest way to keep your chlorine where it needs to be.
Keep in mind also, that "shock" isn't a product, it's a procedure. All it means is to raise your chlorine to a higher level that is determined by your CYA level so that you can kill off algae that's growing in your pool. Generally, you need to raise your chlorine (see the link to the "best guess chlorine chart" in my sig, although you might have to log out to read it until your registration is complete) to shock level, and hold it there until the pool clears and you're no longer losing chlorine overnight. Implied in that statement is the fact that you need to be able to do your own testing...which is why we recommend the K-2006 test kit also linked in my sig. If you can't do that one right now for whatever reason, you can pick up the hth 6-way drop kit at many WalMarts. Barring that, at LEAST you'll need the cheapie OTO kit (uses red and yellow drops for pH and chlorine) to be able to be certain that your pool is cleared up.
So...if you'll post a set of test results taken with a drop-based kit, especially your CYA and pH levels, we'll be happy to get you swimming again in a nice clear pool!
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