Black spots

[renee_carnochan]

I just vacuumed my pool and I have black spots ( looks like) in the corners of my deep end. I have tried brushing them and they do not seem to move. Any suggestions or help would be appreciated. I have a inground vinyl pool.

 

[zea3]

You can try rubbing them with puck and see if it fades any. What are your most recent test results?

 

[renee_carnochan]

Just tested pool
Here are results
FC 1
CC 0
TC 1
PH 7.8
TA 150

Added bleach to up my FC to 2.5

 

[JasonLion]

Do your know your CYA level? If not, you should take your water to a pool store and get a CYA test result.

 

[renee_carnochan]

Can I test my CYA using my TF 100 kit or is that not a valid test?

 

[JasonLion]

Yes, the TF-100 includes a CYA test.

 

[chick3ndude]

You can try rubbing them with puck and see if it fades any. What are your most recent test results?

I currently have a problem with black spots (looks like black algae) and I can tell you that rubbing pucks over it will only makes it fade but it will return again. I tried everything including scrubbing with stainless steel brush, powder in a sock method, super chlorination, nothing works. Black algae is a nightmare.

I'm currently researching acid wash, perhaps this is the only way.

 

[duraleigh]

I'm currently researching acid wash, perhaps this is the only way.

I don't believe so. I believe all forms of algae that occur in pools can be controlled and eliminated with proper chlorination. Some are simply more difficult than others.