One thing we'll need to know is your CYA reading. Do you have a reputable pool store that will test it for you? But don't let them talk you into buying anything else unless you have no CYA. Then, you'll need to buy some but don't put it in yet.
Until your kit arrives, add 2 gallons of plain, unscented bleach each evening unless your test kit shows a chlorine reading that is dark yellow. Run your pump 24/7 and backwash whenever the filter pressure rises 8-10 psi over clean filter pressure.
You also want to add a little 20 Mule Team Borax (laundry aisle at Walmart) to get the pH above 7.2. Add it slowly to the skimmer while the pump is running, breaking up any clumps. I'd start with a half a box. You cannot get an accurate pH reading when your chlorine is above 5ppm, so test it in the evening before you add your bleach.
What kind of chlorine have you been using?
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