Green-ish marks at bottom of pool unite/plaster pool

[socialvista99]

Hey folks,
Bought a house with pool.
I just took over pool maintenance by myself and ordered bunch of new stuff based on reading the forum here
yesterday while cleaning/testing my pool, I saw these photo attached marks and was wondering if its early sign of algae.
I tried to rub using the brush and nothing changed.
Can someone help if these are real algae or some imprints from fallen leaves ..
thanks for all the help in advance !

 

[JamesW]

Looks like a lot of copper stains.

Do you have pictures of the whole pool and system?

 

[socialvista99]

@JamesW here you go

 

[socialvista99]

@JamesW here you go

 

[JamesW]

Probably copper and iron from the heater.

Get a stain ID kit to see what happens.

Stain ID Kit | Jacks Magic

jacksmagic.com

 

[JamesW]

Try putting vitamin C on a spot.

 

[socialvista99]

The heater in the control picture is not functional.

 

[socialvista99]

May be the old owner used it, and caused those actual stains. I’m still getting used to this. I thought I did some wrong chemical additions, caused this lol

 

[mknauss]

Show a picture of the equipment. We see mostly the control panels.

 

[JamesW]

It looks like water is going through the heater, so the metals will still get in the pool.