Hi,
1. Yes your right about the Chlorine test. 2 drops shows a Total Chlorine of 1. You need to get it up to something like 15ppm and hold it there until all the algae is dead.
2. To assist in keeping your Chlorine level up in direct sunlight you will need some CYA. According to your test you do not have any. Where you live and the pools exposure to direct sun determines the amount of CYA you need. Generally aim for 30ppm to get started. If you hang the stabilizer in a sock in front of the return then you can still backwash in the meantime. Try to add most of your chlorine at dusk so it's not fighting the sun and then check in the mornings. If you can add more several times a day to keep it up then that's ideal (but expensive if it's sunny).
3. Vacuum direct to waste and get the crap (aka algae food) out of the pool as soon as you can. I'd do that first before adding a bunch of chemicals. Even if you can't see the bottom you can vacuum blind in a grid pattern.
4. Don't worry about Calcium in a vinyl pool and in any case concentrate on clearing it up and getting your PH TA and Chlorine levels in range.
Use the Pool Calculator to determine amounts.
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