Good idea, follow the slam instructions to the letter, you probably have algae and keep killing it and you have to sweep up the dead algae. The slam will completely erraticate the algae and you won't have any more dead bodies
Since 24 is your SLAM level with your CYA at 60, that’s the FC you shoot for during your SLAM. Just keep testing and raising chlorine to 24, keeping pump going and brushing and vacuuming. This will eliminate your algae, promise! Don’t forget hidden algae traps like stairs, ladders, etc.