I shocked last night 8 gallons of 6%. I checked in the morning and it was still orange but I put in 3 gallons just to be safe for the day. Checked this evening and it was still orange. So If its orange in the morning it will be over 24 hrs of shock levels and it would of held a full night without dropping. I won't be able to check anything with accurate readings until the 2006c comes. I think I'm on the right track though. Thanks a million.