In your pool, each quart of 6% bleach will raise your chlorine level by 1 - 1.5. For the next few days, test your chlorine morning and evening and each time add enough bleach to take your cl back up to 5 or 6. Also, add some stabilizer (cya). Add an initial dose to get up to about 30 ppm. Add it slowly to the skimmer while the pump is running. Then, don't retest for cya, add more or backwash for about a week to give it plenty of time to dissolve in the skimmer. After the cya dissolves, you will be able to just test your chlorine and dose it with bleach in the evenings only.
Your most immediate danger is the low ph. Any reading below 7.0 is acidic and can damage your pool. Add some Borax (to the skimmer). Wait a few hours to let it circulate, then retest and redose as needed to get your ph to 7.4-7.6. Hope this helps you get started.
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