Film on Vinyl Liner

shein33

Member
May 4, 2020
10
Pittsburgh, PA
I didn't cover my pool last year (big mistake I won't make again) so I ended up with a mess when I opened on 5/22. I've been SLAMing since and I think I'm juuuust about in the clear. Yesterday, I noticed there's is a film on the vertical walls of my liner. It's no where to be seen on the slants to the deep end or the bottom. It's a bit rough to the touch. If I run my nails on it to scrape some off, it is a bit yellow in color and gritty. It does not come off easily with my brush.

Any idea what this could be? My pool had a nice carpet of algae on nearly the whole thing.

I SLAMed with Great Value Unscented bleach from WalMart, Pool Shock and a few hits of granular Chlorine.

FC - 16 (Recommended SLAM level)
pH - 7.6
TA - 70
CH - 90
CYA - 85
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,065
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
First -- if your CYA is 90 (round up), your SLAM level FC is 35 ppm.

If you can get a sample of the material, put a drop of acid or vinegar on it and see if it fizzes.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,065
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
It would be advisable to do a sizable drain and refill. With a vinyl liner, you can drain to leaving 12" or so in the shallow end.

When you drain, get a good sample of the material. Dry bleach and some muriatic acid on a couple samples.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,065
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Drain and refill for the CYA.

Still thinking a scale, or a algae/bacteria. Could also be iron. Does your fill water have iron in it?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,065
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
That CYA is OK to high for a SWCG but I thought you were in the SLAM Process?

Some pool stores will test for iron. Take a sample of the pool and the fill water. Do not buy anything.
Do you have a water softener, conditioner, etc? Do your plumbing fixtures get stained red, brown, etc?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,065
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
You will struggle to complete a SLAM at that level of CYA.
 

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