M,
1. The pool store's advice is bogus. It's your call to do with as you like but the advice simply is not valid.
2. I think your testing of the CYA makes more sense than hers....I'm gonna' assume yours is correct. If you get a chance, post all the tests you can from your kit.......I think your results will be more accurate than pool stores......That Alk result of 0 is simply incorrect.
3. Now, since you put in five gallons of bleach after your test results, you'll need to test that again tomorrow evening. Then, if you test @5ppm or below for Cl, please put in 9 gallons of 6% clorox all at once. Yep, 9 gallons. That will raise your Cl to around 25ppm and you will take a big step towards clearing your pool. The next evening, test for Cl again and put in enough Cl to raise it back up to 25ppm......don't guess....test and calculate....get help here if you need it. You will keep doing this 'til your pool is clear, but based on what you're saying, that shouldn't be long...another couple of days probably. Do this even if your pool looks even better tomorrow (it probably will)
4. Once your water is clear, then it will be time to change the sand. Buy it now, if you like, but don't change it 'til you finish your job of clearing the pool.
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