Rust color on filter

[PennyPool]

I just finished cleaning this filter. The dirt is all gone, but why does it have this rust color?

The pool itself looks beautiful.
PH 7.8
FC 3
TA 130
CYA 30

 

[pooladdict]

Your TA and Ph. are somewhat high, that can cause staining.

Other then that, something could of been in your water that discoloured your filter. Remember, its just discoloured, it is not damaged.

 

[pwrstrk]

Are you on a well. Could be some iron staining. ?