Battling algae

Swampthing2829

Well-known member
Jun 30, 2022
69
Seacoast NH
Pool Size
6600
Surface
Vinyl
Chlorine
Liquid Chlorine
Came back from a two day vacation to a lovely shade of light green pool.

I’m struggling with my FC levels during the day. I’d bump my FC up to the max recommendation level, only for it to dip below the minimum threshold by evening. I had no one to add chlorine for me for the 24 hours I was gone, so I bumped by FC up to 20 before I left (aug 12). Pool turned green between the 12th around 10 pm when I left and the 14th at dinner time when I returned.

I’m currently on day 2.5 of SLAM (started the evening of the 14th). Haven’t let FC get below 15.5, keeping it at 20 and testing at least 3-4x a day.

Pool is barely getting better. Water is clear but teal. Husband is getting impatient with me and wants to use dichlor shock and I’m telling him absolutely not with our CYA at 50.

Am I on the right track?
 

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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
51,244
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Am I on the right track?
Yes you are.

Be sure you brush really well a couple times per day if possible.

Any steps or hiding spots for algae?

Also, you are not saving your test results to your Poolmath app. What was the pH prior to starting the SLAM?
 

Swampthing2829

Well-known member
Jun 30, 2022
69
Seacoast NH
Pool Size
6600
Surface
Vinyl
Chlorine
Liquid Chlorine
Yes you are.

Be sure you brush really well a couple times per day if possible.

Any steps or hiding spots for algae?

Also, you are not saving your test results to your Poolmath app. What was the pH prior to starting the SLAM?
7.4 ph
There are steps, I’ve removed them so I can spray with bleach solution and sun dry to (hopefully) kill anything lurking there.
We are vacuuming and brushing each day so far. The dolphin is coming up clean minus some sand
 

Mdragger88

Bronze Supporter
TFP Guide
Jun 1, 2018
6,931
Hernando, Ms
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
There won’t be any difference fc wise in using Dichlor to maintain slam level fc vs using liquid chlorine- there will however be unwanted effects on your ph, cya, & your wallet.
You’re on the right track, stay the course with liquid chlorine & show him this to clear up the confusion 👇
C99BC4F3-9D60-4996-A857-3D66A1BA6535.png79A78D1C-26B3-41B9-B0D9-207BB07B59F9.png
SLAM ON 👍🏻
 

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Swampthing2829

Well-known member
Jun 30, 2022
69
Seacoast NH
Pool Size
6600
Surface
Vinyl
Chlorine
Liquid Chlorine
Looking MUCH better today!! But still lost about 6 ppm chlorine overnight last night. 20 at 11 pm, 14 at 9 am. Photo 1 was yesterday morning and you can see my stairs green looking in the water yesterday but much better looking this morning in photo 2!!
 

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Swampthing2829

Well-known member
Jun 30, 2022
69
Seacoast NH
Pool Size
6600
Surface
Vinyl
Chlorine
Liquid Chlorine
I’m knee deep in SLAM and have passed all the tests except the OCLT. My question is why is my overnight loss getting worse by the day instead of better? It was 6 ppm loss when my pool was teal a few days ago. Last night, with a crystal clear pool, I lost 8 ppm.
Obviously I’m still fighting something but I’m not sure how typical it is for the OCLT to get worse before resolving or how long it can possibly take to pass this test after all the other benchmarks have been hit?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
40,592
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
why is my overnight loss getting worse by the day instead of better? It was 6 ppm loss when my pool was teal a few days ago. Last night, with a crystal clear pool, I lost 8 ppm.
Interesting that you seeing such a large FC loss with clear water. :scratch: Are you using liquid chlorine to maintain the required SLAM FC level? Any problems with the filter, reading PSI increase, or backwashing process? Any concerns with items noted in the SLAM Process page?
 

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