You need a good test kit. Pool store testing is notorious for being more concerned with selling your chemicals than being accurate.
The test kit that we think is by far the best is the Taylor K2006 or 2006C (better buy). Not available locally but you can get it through this link that takes you to Amazon: http://pool9.net/tk/
But, in the meantime, go to Walmart and see if they have the HTH 6-Way drops-based kit (no test strips!) and get that. If they don't, get an OTO/Phenol Red kit (yellow and red drops) instead. Use it to test and then post your numbers.
What were the ingredients of the powdered shock that you used?
Sounds like your filter is working.
Repost with requested info and then someone here can try and help you.
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