I would very strongly suggest that you get your own test kit and not rely on pool store testing. Pool store testing is designed to sell chemicals. Check out the K-2006 kit in the testkits link in my sig--that's the one we recommend to everybody.
The first thing you're going to need to do is get some chlorine in the pool, and it doesn't look like the trichlor tabs are doing the job. I would add a gallon and a half of plain, generic, ultra bleach. Each gallon of 6% bleach you add will raise your FC by 2. 2ppm, so the extra half gallon will kick it up to3.3 ppm....and with a CYA of 30, you're going to need to keep your chlorine at a minimum of 3 ppm at all times, otherwise the algae will come back (see the best guess chlorine chart linked in my sig for the chart and more explanation on that). This may mean that you have to test and add another gallon during the day tomorrow. I would also test your chlorine tonight after the sun is off the pool, and again in the morning before the sun hits the pool. If you've lost more than 1 ppm of chlorine in that time, then there's something in the water creating the demand, and you need to shock the pool (shock level for CYA of 30 would be chlorine of 15 ppm) to kill off whatever it is.
Since your alk is going to come down with the ph when you add acid (read the "using muriatic acid" link in my sig, before doing so), you can raise the Alk using arm & Hammer baking soda, which will raise the alk with very little effect on pH. Then when you have the alk up, you can use the muriatic acid to bring the pH down. The alk will come back down with it, but if it only comes back to 70 or so, then that's fine.
You do need a calcium level between 200-400 for a plaster pool, to keep the water from leaching the calcium from the plaster. You can add it via calcium flakes, or if you have cal-hypo on hand, use that for chlorination for awhile and it will raise calcium and chlorine at the same time.
Of course, you're going to need to be able to test your own water to straighten this out without the pool store breaking you--did you order your kit yet?
Welcome to the forum!!
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