help, brownish stuff on the bottom of my pool!

[aznfayeth]

Took off the solar cover today to discover brownish stuff on the bottom of the pool that wasnt there yesterday. It brushes off easily and the water is clear. Do you think it is algae? I am going to do an overnight fc test tonight. I havent turned on my swg since 6/30 cause my fc tends to run high(running it for 2-4 hrs will make my fc 9-10). The only reason why I suspect algae is because I had an incident on 6/26 when the fc dropped to 0 after a day of sunlight and a few days worth of rainwater debris accidentally dumped in.

Below is the running log of my tf100 kit results copied from my other thread:
why-is-my-free-chlorine-so-high-and-other-tf100-questions-t14455.html

tf100 kit results(7/6)
fc: 4
cc: 0
tc:4
ph: 7-7.2
ta: 110
cya: 20?(added 24oz of cyanuric acid on 6/27)
temp: 81 degrees




6/25 11a tf100 kit results
fc: 10
cc:0
tc:10
ph: 7.2-7.5
ta: 120
temp: 68 degrees


tf100 kit results(6/26 9a)
fc: 0!!!
cc: 0
tc:0
ph: 7
ta: 110
temp 70 degrees


tf100 kit results(6/26 4p)
fc: 2.5
cc: 0
tc:2.5
ph: 7.2
ta: 110
temp: 68 degrees


tf100 kit results(6/27 11a)
fc: 8
cc: 0
tc:8
ph: 7.5
ta: 110
temp 74 degrees

tf100 kit results(6/30)
fc: 9
cc: 0
tc:9
ph: 7.2
ta: 110
temp: 77 degrees

tf100 kit results(7/1)
fc: 7
cc: 0
tc:7
ph: 7.2
ta: 110
temp: 77 degrees

tf100 kit results(7/2)
fc: 6.5
cc: 0
tc:6.5
ph: 7.2
ta: 110
temp: 77 degrees

tf100 kit results(7/3)
fc: 6
cc: 0
tc:6
ph: 7.2
ta: 110
temp: 76 degrees
Finally vacuumed the floor of the rainwater debris.

tf100 kit results(7/4)
fc: 5.5
cc: 0
tc:5.5
ph: 7.2
ta: 110
temp: 76 degrees

tf100 kit results(7/5)
fc: 5
cc: 0
tc:5
ph: 7.2
ta: 110
temp: 79 degrees

 

[aznfayeth]

After 4 hrs of swg, water was crystal clear and so blue that we decided to jump in for the first time since we set up the pool 3 weeks ago. Water was a toasty 84 degrees with the solar panel. It was great.

tf100 kit results(7/6 6p)
fc: 6
cc: 0
tc:6
ph: 7-7.2
ta: 110
cya: 20?(added 24oz of cyanuric acid on 6/27)
temp: 84 degrees


Overnight fc loss test:
tf100 kit results(7/6 9p)
fc: 5.5
cc: 0
tc:5.5


tf100 kit results(7/7 8a)
fc: 5.5
cc: 0
tc:5.5
ph: 7.3-7.4
ta: 110
cya: 20?(added 24oz of cyanuric acid on 6/27)
temp: 82 degrees

I admit I woke up late 3 hrs after sunrise so the pool got a little sunrise before I did the test but I had no chlorine loss at all! Maybe it was just dirt that had settled to the bottom after vacuuming on friday???

 

[aznfayeth]

pics of our pool

 

[reebok]

probably was. a picture of it would be good too.

 

[dattia]

I think seeing the brown stuff on the floor makes everyone panic a little bit. I get it everyday. There is a highway that runs by my house and despite a nice tree barrier, I get a black dust all over my house all the time. It took me a while to realize that if it is falling on my house, it surely must be falling into the pool too.

Pathetic as it sounds, I actually enjoy getting in to vacuum it up every day...

 

[AnnaK]

Vacuuming does wonders for the odd brown stuff.