Algae on walls

Eisha1809

Member
Jun 18, 2022
6
Arizona
Pool Size
12000
Surface
Plaster
Chlorine
Liquid Chlorine
Hello, I have a 12,000 gallon pool. Cartridge filer and VS pump. I have kept a free chlorine level of at least 4 but have been seeing algae start growing. Do I need to SLAM if it’s just small amounts of alage? From what I have read about SLAM is that seems it’s for when the water is green and cloudy and clearly needs a mass amounts. My water is clear I can just see the green showing up on the walls.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
47,942
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Welcome to the forum!
You have visible algae. You need to follow the SLAM Process. To do that, you need a proper test kit. I suggest the TF-100 or Taylor K2006C. A proper test kit is needed to get the accurate water chemistry results needed to follow the TFP protocols.
I suggest you read through Pool Care Basics - Trouble Free Pool and even look at a few of our videos TFP-TV - Trouble Free Pool
 
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Eisha1809

Member
Jun 18, 2022
6
Arizona
Pool Size
12000
Surface
Plaster
Chlorine
Liquid Chlorine
Thank you! I have the test kit, I have the Taylor K2006C. I will start SLAMing on Sunday! I’m really confused why I had algae grow in the first place, but thanks for your help.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
37,614
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
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SWG Type
CircuPool RJ-45 Plus
Be sure to update your signature with all of you pool details. See ours as examples. When you get a chance, post a full set of those test kit results and we'll help. Welcome! :wave:

full
 

jeffchap

Bronze Supporter
TFP Guide
Jun 26, 2012
2,136
Edmond OK
Pool Size
27500
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Thank you! I have the test kit, I have the Taylor K2006C. I will start SLAMing on Sunday! I’m really confused why I had algae grow in the first place, but thanks for your help.
There is only one cause for algae -- insufficient FC for your CYA level. You provided your FC, but without knowing what your CYA is, we can't tell if that's sufficient or not. Given that you have algae, it's obviously not. We need to know your CYA to determine what your minimum FC should be.
 
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Katygreys

Well-known member
Mar 5, 2022
108
Katy, TX
Pool Size
18000
Surface
Plaster
Chlorine
Liquid Chlorine
There is only one cause for algae -- insufficient FC for your CYA level. You provided your FC, but without knowing what your CYA is, we can't tell if that's sufficient or not. Given that you have algae, it's obviously not. We need to know your CYA to determine what your minimum FC should be.
Exactly!! :)
 

Eisha1809

Member
Jun 18, 2022
6
Arizona
Pool Size
12000
Surface
Plaster
Chlorine
Liquid Chlorine
There is only one cause for algae -- insufficient FC for your CYA level. You provided your FC, but without knowing what your CYA is, we can't tell if that's sufficient or not. Given that you have algae, it's obviously not. We need to know your CYA to determine what your minimum FC should be.
So my CYA is at 65. I started the SLAM process on Saturday night. I have been running my pump constantly. I have the Poolmath app so I have been going off of the FC amount that it suggests. My pool is clear I don’t see any more algae. I don’t know what’s eating up my chlorine now I checked it last night and it was at 24 I woke up this morning to it being at 18.
 

jeffchap

Bronze Supporter
TFP Guide
Jun 26, 2012
2,136
Edmond OK
Pool Size
27500
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Also, round up your CYA to 70, making your FC SLAM level 28. CYA is a logarithmic scale, so we don't count anything between the tens and round up to the next whole multiple of ten.

You'll probably need to brush that algae on the walls to get rid of it. That's always the hardest to get rid of for me. Brushing it really helps.

And once you pass the OCLT, make your FC target 7 and *never* let it drop below 5 and you shouldn't have any further problems with algae.

Keep us posted!
 

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Eisha1809

Member
Jun 18, 2022
6
Arizona
Pool Size
12000
Surface
Plaster
Chlorine
Liquid Chlorine
Also, round up your CYA to 70, making your FC SLAM level 28. CYA is a logarithmic scale, so we don't count anything between the tens and round up to the next whole multiple of ten.

You'll probably need to brush that algae on the walls to get rid of it. That's always the hardest to get rid of for me. Brushing it really helps.

And once you pass the OCLT, make your FC target 7 and *never* let it drop below 5 and you shouldn't have any further problems with algae.

Keep us posted!
Thanks for all your help! I’m still so new and learning as I go! I’m hoping you can help me again. I have been SLAMing since Saturday night. The pool is super clear, I have been brushing like crazy and gone through so much LC. I just can’t seem to pass the over night loss. Is there something else I should do/ be doing?
 

Eisha1809

Member
Jun 18, 2022
6
Arizona
Pool Size
12000
Surface
Plaster
Chlorine
Liquid Chlorine
A drop of 6ppm overnight indicates you still have a problem. Keep your SLAM going.
Is there something else I should be doing to be sure everything is clear? I have gone through so much LC I don’t know what is going on. When I brush the walls or the floor nothing comes up. It’s the cleanest it has ever been. But I just can’t seem to pass the over night test.
 

kschmidt1

LifeTime Supporter
Aug 2, 2015
176
Grandy, NC
since you are still slamming, when you check your FC in the morning, are you doing a Combined Chlorine test right after? Involves 5 drops of 0003 in clear FC result. If it changes from clear back to pink again, still fighting algae. If stays clear, wonder if the chlorine you are adding is still good. Just my 2 cents. Good luck.
 

Eisha1809

Member
Jun 18, 2022
6
Arizona
Pool Size
12000
Surface
Plaster
Chlorine
Liquid Chlorine
since you are still slamming, when you check your FC in the morning, are you doing a Combined Chlorine test right after? Involves 5 drops of 0003 in clear FC result. If it changes from clear back to pink again, still fighting algae. If stays clear, wonder if the chlorine you are adding is still good. Just my 2 cents. Good luck.
Yes I have done the combined chlorine. It is clear.