I have a 2 year old Gunite and Salt water pool. Here in Orlando, Fl - the pool is open all year. Regrettably, I haven't been the best pool keeper. But I am attacking with full force now.

Recently got the ph to 7.4 -- down from 8.0.

I have what appears to be some yellow staining on walls and edges of stairs in the pool.

How can I tell if this is a metal problem or an algae stain?

Thanks