Hi all,
I've had my house/pool a little over a year, and this morning as I was brushing the walls, I noticed some dark green spots. Investigating, I see that they are actually behind the plaster. As I peeled off a little off the plaster just with my fingernail (you can see in the second pic where I peeled off a little dime sized piece of plaster, I found more green behind it. When I rub the spots with my finger, a familiar green cloudiness rubs off into the water.
My questions are:
1. It's not staining through the walls at all, and all my levels are good, but can algae live behind the plaster where the chlorine doesn't affect it, and not show through the walls?
2. What do I do about it? I just finished my last SLAM like 3 weeks ago. Do I need to SLAM again, even though the water is crystal clear and all tests are good? I'm worried that the SLAM will kill what's visible, but then there will be more underneath anyway. I brush the pool every few days like clockwork, and just noticed this the last few days.
Thanks for any help. Pics attached. Test results are shared through the app, but just in case, posted below.
Brett
FC 8.5 (like I said, I'm very very slowly and cautiously allowing myself to let them fall - I have had algae blooms every few months or so since I moved it, and the last algae bloom I had was in early May, when my pH was at like 7.8, CYA was 80-90, and FC never dropped below 7.5. So I'm very carefully and slowly bringing the FC back into range).
CC 0
pH 7.7
TA 80
CH 300
CYA 70
Temp: 80 degrees
I've had my house/pool a little over a year, and this morning as I was brushing the walls, I noticed some dark green spots. Investigating, I see that they are actually behind the plaster. As I peeled off a little off the plaster just with my fingernail (you can see in the second pic where I peeled off a little dime sized piece of plaster, I found more green behind it. When I rub the spots with my finger, a familiar green cloudiness rubs off into the water.
My questions are:
1. It's not staining through the walls at all, and all my levels are good, but can algae live behind the plaster where the chlorine doesn't affect it, and not show through the walls?
2. What do I do about it? I just finished my last SLAM like 3 weeks ago. Do I need to SLAM again, even though the water is crystal clear and all tests are good? I'm worried that the SLAM will kill what's visible, but then there will be more underneath anyway. I brush the pool every few days like clockwork, and just noticed this the last few days.
Thanks for any help. Pics attached. Test results are shared through the app, but just in case, posted below.
Brett
FC 8.5 (like I said, I'm very very slowly and cautiously allowing myself to let them fall - I have had algae blooms every few months or so since I moved it, and the last algae bloom I had was in early May, when my pH was at like 7.8, CYA was 80-90, and FC never dropped below 7.5. So I'm very carefully and slowly bringing the FC back into range).
CC 0
pH 7.7
TA 80
CH 300
CYA 70
Temp: 80 degrees