Before you guys are in disgust, just be prepared... you may feel sorry for my pool by the pics
The pool hasn't really been looked after for years, and just got worse and worse throughout. Anyway, as you can see in the pics, there's brown stains that I've noticed have been growing lately (never there before). Also, seems black-like algae this time developing, (pool was dark green a few months ago with heavy algae).
With those big round brownish circles in the deep-end, they've always been there but now I notice (as shown in 1st pic), the brown spot leaving a brown trail. Even as I vacuum the pool, leaves end up leaving a brown mark on the floor which has never happened to me before.
Any helpful advice/tips would be much appreciated.