Keeping the chlorine high. I can't guarantee it's stayed 15 since yesterday at lunch but I've kept it above 10 by adding a gallon last night and today. I have no idea what it is now and without a reliable kit I just didn't want to chance it going low. I hope it's not way too high right now. Water has cleared a few more inches down but still haven't seen the bottom. Supposedly my kit is getting overnighted. We'll see.