Tonights the night. My ph went down just tested. It is 7.8. My fc is 5 and my Slam with my approximate CYA is 18. So i will bring to 20 as u suggested due to mr closing tomorrow. But let me ask u a calculation. It says to add 1 gallon,2 quarts,2 cups. That means in english ….1 and 1/2 gallons...