Right... typically pool store testing and advice is garbage. I do see on your test the box is checked for green algae. If that is the case, you need to start the SLAM to get rid of the algae.
Here is what I would do:
1. Stop going into the pool store. They try to alarm you and get you to buy all sorts of magic potions that do not work and can many times lead to other issues like staining, gumming up your filter, etc.
2. Get your own test kit (see my signature if needed)
3. Buy liquid chlorine (walmart, lowes, home depot, pinch a penny, etc.) and add 3/4 of a gallon per day until your test kit arrives.
4. Read up on the SLAM process in the pool school links to the left
5. Post up your test results from your test kit and we can guide you through your SLAM.