Is this algae? Noticed in on my steps.

[gocubs418]

Hello,

Noticed these little dots on one of my bench. Just tested the pool as well

FC 4.0 PPM
TA 100 PPM
Calcium 350 PPM
pH 8.2+

Is this caused from the high pH? I was going to pour some MA into the pool tonight based on the poolmath calculator.


Thank you as usual.

IMG_20180729_135611.jpg - Google Drive

 

[mknauss]

Hard to say from that picture.

Regardless, lower your pH to the low 7's. May take a few applications.

What is your CYA?

 

[gocubs418]

Hard to say from that picture.

Regardless, lower your pH to the low 7's. May take a few applications.

What is your CYA?

CYA is at 50 PPM. Sorry, I forgot to put that one. I need to raise it back up to 90.

I took a scouring pad and the stuff didn't budge.

 

[mknauss]

Get some Vitamin C tablets and put them in a sock and crush them up. Set that on the stains. If they disappear, it is iron.

Any granulated fertilizer used around the pool lately? Some of those have iron.

 

[Jannylee53]

Get some Vitamin C tablets and put them in a sock and crush them up. Set that on the stains. If they disappear, it is iron.

Any granulated fertilizer used around the pool lately? Some of those have iron.

Good info.

 

[gocubs418]

Get some Vitamin C tablets and put them in a sock and crush them up. Set that on the stains. If they disappear, it is iron.

Any granulated fertilizer used around the pool lately? Some of those have iron.

Added MA the other night. Tested 48 hours later, pH dropped to 7.8. Spots gone. You are amazing. Thank you.

I am going to try to keep my pH around 7.5 so I added a little more MA last night.

 

[Jannylee53]

Congrats!

 

[gocubs418]

Updated:

Definitely not gone.

It is 100% some form of algae.

Do I need to SLAM it or just raise the chlorine levels high for something like this?

I already began the SLAM process but I'm only at 16PPM Chlorine right now. For SWG @ 50 CYA, Shock level is 24PPM. That's a lot of bleach.

I got some stabilizer coming in the mail as well. I'll raise my CYA up a bit.

Thoughts?

 

[jmikeb]

if you raise your cya , it will take more bleach to slam

 

[gocubs418]

if you raise your cya , it will take more bleach to slam

Good point. I'll hold off from adding stabilizer for now.

 

[JimMarshall]

Updated:

Definitely not gone.

It is 100% some form of algae.

Do I need to SLAM it or just raise the chlorine levels high for something like this?

I already began the SLAM process but I'm only at 16PPM Chlorine right now. For SWG @ 50 CYA, Shock level is 24PPM. That's a lot of bleach.

I got some stabilizer coming in the mail as well. I'll raise my CYA up a bit.

Thoughts?

You don't want to raise your CYA until you complete a SLAM.

 

[gocubs418]

You don't want to raise your CYA until you complete a SLAM.

Good point.

I got it up to 18PPM. You think that enough?

 

[jmikeb]

it’s important to slam at the correct fc/cya ratio. in addition, your fc needs to be checked very often, especially at first

 

[JimMarshall]

Good point.

I got it up to 18PPM. You think that enough?

Your CYA is 18? How are you testing? 18 is below the threshold of available testing accuracy.

We recommend 30 PPM CYA for a SLAM Process because you want enough CYA to keep your FC from just straight burning off in the sun, but we need to make sure you’re getting accurate readings and have accounted for any CYA you added that might not be showing up in tests yet before you try to add any more.

 

[jmikeb]

i think he meant his fc is 18... i think he said his cya was 50

 

[gocubs418]

i think he meant his fc is 18... i think he said his cya was 50

Yes, my FC was 18PPM. CYA is 50.