Light Brown stained vinyl liner everywhere but under wedding cake pool steps

[PoolDoc]

+ Buy a small bottle of "Iron-Out" at Walmart, etc..
+ Make a strong solution of Iron-Out -- 3 tablespoons in 1/2 cup warm water.
+ Dissolve as much as you can.
+ Saturate an old washcloth in the solution.
+ Then, while wearing plastic gloves, place the washcloth directly on a brown spot, and hold it there for a minute, pressing firmly.

If the brown is gone, or lightened, when you remove the cloth -- it's iron staining. Otherwise, I don't know what it might be.

[kelhoda]

Thank you...I will try soon, maybe later today. So, I noticed that you did not mention brown algae or something along those lines...is that due to the water being clear, the fact it cannot be brushed off of the liner with just a brush or my hand or is there another reason for the fact that it is probably NOT related to an algae problem?
Thanks again.

[PoolDoc]

Right. As far as I know, you can always *feel* algae on a liner pool, by touching the liner. And brown algae (not that common), can be at least partially brushed away.