Accidentally added 5lbs of fertilizer to the pool

[V___25]

Have you read through this article on Pool School? It can help differentiate between organic and inorganic stains and how to test/treat each one.

 

[borjis]

Probably iron stains from the fertilizer you accidentally put in.
It works best to keep your questions in a single thread. You'll get better help that way.

 

[Discokatt]

Probably iron stains from the fertilizer you accidentally put in.
It works best to keep your questions in a single thread. You'll get better help that way.

Thank you! The yellow was actually there from before we added the fertilizer, that's is why I started a new thread

Thanks to V__25 as well - I will try and test if it's organic or iron!