OK. first you need to get pH up ASAP. Start by putting a box of 20 Mule Team Borax in the skimmer. Check pH in an hour and if it's not up to 7.2, put in another box. That should do it, but don't use both at once. Add one. Wait, test, then add the other, if needed.
I'm guessing 32k gallons. So add 6 gallons of 6% bleach (unscented, regular bleach) which should bring your FC up to just over 10ppm and acts as a shock.
Then you'll need to add stabilizer. It's called CYA, stabilizer, conditioner, Cyanuric Acid or IsoCyanuric Acid. Whatever it recommends for your size pool, use no more than HALF. put it in an old sock or pantyhose and hang it over the side, preferably in the return stream. It will take a few days to get in. Aim for a level of 30ppm to start.
You'll also need a proper test kit. In PoolDoc's, Watermom's and aylad's sig is a link to purchase the Taylor K-2006 test kit. Some money goes to help support the forum but none comes to us.
Also, read everything you can at PoolSolutions.com, our sister site.
Carl
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