Algae or not?

[Rob621]

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]

An overnite FC loss test will tell if it was sufficient or not.
1ppm loss or less equals good to go.

 

[dmanb2b]

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]

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

 

[woodyp]

that's a normal FC loss with sun and swimmers.

 

[frustratedpoolmom]

your PH is too high (unrelated to your question, I know)