Algae or not?

Rob621

Well-known member
Today I noticed a darker discoloring along the bottom of my pool where the botton ond side seam together on a slight angle (those familiar with vinyl liner pools know where I'm talking about). Otherwise, water is clear and clean. My first thought was algae. Being new to pool ownership I thought I would throw it out. Anyone have any thoughts on if this is likely algae or not? Can algae be present like this in an otherwise extremely clean looking pool? I brushed it off and jacked up the bleach slightly higher than normal (but not near shock level). Should this be sufficient treatment (assuming it is algae)?

Thanks,
Rob
 

woodyp

Mod Squad
TFP Expert
LifeTime Supporter
Apr 17, 2010
10,272
East Texas
An overnite FC loss test will tell if it was sufficient or not.
1ppm loss or less equals good to go.
 

dmanb2b

TFP Expert
LifeTime Supporter
Apr 4, 2009
3,734
NY
Please post a full set of test results and as woody mentioned, you can confirm with an overnight FC loss test. If you loose 1ppm or more overnight, you should shock.
 

Rob621

Well-known member
I did an overnight FC test last Thursday/Friday with no loss. Didn't take a test yet today, but results have been:

FC-target of 5 but usually dropped to 2 within a day when I was replenishing bleach
CC-0
TA-120
pH-8.0
CYA-40
CH-65
 

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