After being gone for about 4 hours (not ideal...but kids games, etc.) came back and was at FC - 1.0, CC - 1.0. Added 2 gallons of 10% and ran for 30 minutes. Test was FC - 1.8 and CC was 1.4. It is hot and sunny today unfortunately - was supposed to be cloudy and rainy all day.
The CYA is...