Even better. So you have fairly new water. Then this should be much easier. Start by adding stabilizer (CYA) for a CYA target of 40. To increase CYA via granular stabilizer, place the required amount as calculated by the
Poolmath calculator into a white sock and place in the poolside skimmer basket. For those concerned about suction flow to the pump, suspending the sock near a return jet or from a floating device will also suffice. Best never to allow undissolved granules to rest directly against the pool surface. Squeeze the sock periodically to help it dissipate. Once dissolved, consider your CYA adjusted to that programmed (target) level. CYA test readings should show a rise in 24-48 hours, however some pools may experience a longer delay to fully register. Best to confirm final CYA in about 5-7 days before adding any more stabilizer/conditioner.
With a CYA target of 40 (soaking), you are now ready to add bleach. On this first day, only add enough regular bleach (HEB-Bravo or Wal-Mart Great Value) to increase FC to about 3 ppm. After that, maintain your around 4-6 and NEVER below 3. Pour the bleach slowly near a return jet(s).
Next you test/adjust pH (red drops). If the pH is high and over 7.8 (dark purple), you need to lower with muriatic acid back to around 7.5-7.6.
You can start the stabilizer soaking right away with no impact on other items. Separate the bleach and acid by about 15-20 minutes with pump running. After all of that has mixed really good for about 30 min to an hour, run one more full set of test results and post them back here so we can make sure those are doing good, and we'll also look at your CH and TA as well. Exception - don't bother testing the CYA for another 2-3 days. Let me know if you have any questions.