Algae Looking Stains while opening

far3171

Well-known member
Jun 16, 2015
59
Burke VA
Hey TFP :wave:,
I just opened up my pool last week to what i thought was not a terrible winter, after running my pump constantly and shocking my pool water is crystal clear but the vinyl liner is not nearly as vibrant as it usually is (blue) its more of a greenish tint to it. I've brushed and brushed and brushed but it wont come off, i even put on a new cartridge filter.
Test Kit Results
FC-6
CC--6
CYA-35
PH- 6.8 (YIKES!!) I'll be adding some borax soon
TA- 100
CH-75

I read a few places that low PH can hurt vinyl liners, is there anything i can do to restore it.
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
23,602
San Dimas, CA (LA County)
I'm thinking either Iron stains or tannin (rotting leaf tea). Either one can be orangish, which with a bluish pool gives it a greenish cast.

Try rubbing a vitamin C tablet on it, like the guy in this picture. If that doesn't lift it, then just be patient. Time and chlorine will fade it,
 

far3171

Well-known member
Jun 16, 2015
59
Burke VA
Thanks guys for the help...I got my ph back up to 7.2 using borax..ran the pump for 48 hours and now the pool looks like it's supposed to.