Now is the time to test your full water using one of our recommended test kits, either the TF-100 or the Taylor K-2006C. If you don't have one, the links are in my signature below.
Until you get your test kit, you need to add 5 ppm liquid chlorine to your pool every day. You can figure that using
PoolMath.
Also read
ABCs of Pool Water Chemistry several times until it clicks for you.
You can go ahead and get the chemicals you're going to need, but don't add them until you test your water. Those chemicals are
Stabilizer or CYA -- in the garden section at Wal-Mart
20 Mule Team Borax -- laundry section of grocery store or Wal-Mart
Washing soda-- ditto
Liquid chlorine -- garden section of Wal-Mart or laundry section for PLAIN bleach, not scented or splashless, no Cloromax
No need to go to the pool store for the same stuff at premium prices!I
Using PoolMath, figure out how much CYA to get to 30 ppm, and add that in a sock or pantyhose in front of the outlet where the water comes back into the pool. Wait to add the other things until you can test.
And that's it!