I've been doing some research and it seems like they are both the same, it's just shock is a higher %.So my question is I get shock at $2.99 a gallon because I buy a case of 4 at a time. But I have been putting two gal of bleach every day until my Taylor k2006 tester comes in. My water is still cloudy. I also have powdered shock. Can I use that up? Put in 2 lbs a day? It reads that 1lb will treat 13,000 gal.