Stained Vinyl Liner

[Cpagasky]

Thanks for the reply Yeggim, I went ahead and ordered the k-2006 this morning.

[aylad]

You won't regret it--it will make keeping a clear pool SSOOOO much easier!

Janet

[Cpagasky]

Here are my latest readings after getting my new test kit.
Cl - 11
pH - 7.4
Alk - 140
Cyn - 100
Calc Hardness - 250

My water is crystal clear but I'm still having the staining issue. It doesn't seem to be as profound as it was before I increased the Chlorine to shock levels, but it is still noticeable. It appears to be a light brown and its mostly concentrated around the edges of the pool and primarily on the far end opposite the filter at the top of the slope in the deep end.

Let me know if anyone has any ideas.

Thanks

[TomC]

I know this is just stating the obvious, but here goes.....Make sure that in addition to chemically attacking that algae, you are physically attacking it too. Get out the brush attachment for your skimmer pole and every morning brush the liner areas where the algae thrives. My apologies if you are already doing this.

Tom

[Cpagasky]

No problem Tom, I have been brushing it and I'm leaning back toward my initial thoughts of this being a stain as opposed to algae. I had kept the pool at chlorine shock levels for seven days and the levels have remained since. I think there may have been some algae originally as I had some issues getting my chlorine correct early in the year due to large amounts of rain but the stain was always hiding under it. I may just live with it through the summer and try to work on it later in the year when I can lower the chlorine levels and use some stain remover. Let me know if anyone has any better ideas. Thanks

[PoolDoc]

Stains that fade -- but do not disappear -- in *liner* pools with lots of chlorine and no algae are often a result of fungus or mold growing on the DIRT side of the liner. Pigment from the growth will leach through the liner.

There's no real fix, except replacing the liner and treating the underlying surface to prevent regrowth.

[Cpagasky]

That could very well be the case, but as I said earlier I've had these stains last year as well and when I treated with oxalic acid the stain will disappear for a short time only to return a couple days later. Would that be consistent with a fungus on the backside of the liner?