Do NOT add more chlorine; rusty colored OTO = 30+ ppm FC. With CYA=40 ppm, you don't want to go quite that high. Instead do this:

1. Complete the Pool Chart, so we can see what you are dealing with:
Pool Chart Entry Form
2. If you aren't already, begin filtering 24/7

3. Maintain an orange -- not brownish-orange -- OTO level.

4. Don't use any more algaecide; that algaecide is NOT compatible with high levels of chlorine.