Hello, and welcome to the forum!!
#1. When adjusting chemicals, normally you first want to get "some" chlorine into the water. Next, get your pH adjusted to between 7.0 and 7.8. With yours currently at 6.4, this becomes the priority for you, because pH lower than 7.0 is too acidic and can damage your pool liner. Get some Borax and get it into the skimmer, very slowly, breaking up clumps--I'd start with a couple of cups--just add it slowly enough that you don't clog your piping. Let it circulate for a couple of hours, retest pH, and add more Borax if necessary. When you get your pH above 7.0, then you can stop there for now. After pH and chlorine, then you need to get the stabilizer in the pool, which, if added through the skimmer, can take up to 4-5 days to dissolve and register. If you have added it via broadcasting, then you've probably already vacuumed out what you added and need to start over. The pucks will add some, but it will be awhile before it gets high enough to register. AFter all that is under control, THEN I would start worrying about your alk.
#2. The reason you can't keep chlorine in the pool is probably that your stabilizer is zero. Until you have some CYA in the water, you'll need to add chlorine a couple of times daily to replace what the sun is consuming. If you test at night and again in the morning before the sun is on the pool, and you still have lost chlorine, then you probably need to shock the pool by bringing your chlorine level up to 12-15 ppm.
#3. Forget the clarifiers, they are just adding chlorine demand to your pool. If you have adequate chlorine in the pool, and your filter is working properly, the water will clear up. For now, I wouldn't add anything except chlorine, CYA, and Borax. As far as lowering the alk, when you get to that point, you're only supposed to lower the pH to 7.0, and then aerate your water to raise the pH again before adding more acid. That way the TA is ratcheted down again and the pH stays high enough not to damage your pool. Here's the procedure.. http://www.poolsolutions.com/gd/lowe...p-by-step.html but you're going to need a good, drop-based test kit instead of strips in order to do it correctly.
#4, If you'll add the powders to the skimmer, very slowly, then they can sit on the cartridge and dissolve. You'll just have to not add too many at a time to keep from clogging up the filter. The other option is to put the powdered chems in a sock and suspend them in front of your return, so it dissolves straight into the water and doesn't gunk up your filter.
#5. Forget the algaecide, it's adding chlorine demand, and quite possibly adding to the haziness of your water, depending on what type you use. The only one we recommend here is Polyquat 60, and even then only in certain circumstances. If you keep adequate levels of chlorine in the pool, you don't need algaecide.
#6. See response #1.
Welcome to the forum!!
Janet
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