Pool math question

[jhenson67]

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Ok I’m doing the SLAM and clean after work

 

[jhenson67]

Wow! I did the SLAM yesterday around 5pm, checked it today at 8pm and the FC went down to 4ppm. The bottom is now covered with dead stuff. I did the SLAM level of chlorine add again to make sure all the algae was dead. I’ll vacuum to waste tomorrow and see where the FC is and add to bring it up to 7ppm (cya is still 80).
Hopefully the cya will go down after the vacuum to waste and refill.

 

[mknauss]

Have you read SLAM Process? The M in SLAM is for Maintain. You Maintain SLAM FC levels by testing and adding liquid chlorine several times per day, until you pass the three criteria spelled out in the article.

 

[jhenson67]

I had to work today so I couldn’t add chlorine until I got home. I’ll do it again tomorrow. I have read all of the articles and I have learned from them.
I met all three criteria before I started. There was however yellow algae on the floor, steps and walls.
I have a case of LC coming in case I have to do it again.

 

[mknauss]

I met all three criteria before I started. There was however yellow algae on the floor, steps and walls.

If you have algae, by definition, you do not have crystal clear water.

Great you can attack it tomorrow.

 

[jhenson67]

Success, although this is what it look like a day before my wife found the algae.

 

[jhenson67]

Success, although this is what it look like a day before my wife found the algae.

 

[jhenson67]

I’ve got a question about CSI. Is -.63 of concern for a fiberglass pool? I saw were it’s corrosive to plaster.

 

[mknauss]

I’ve got a question about CSI. Is -.63 of concern for a fiberglass pool? I saw were it’s corrosive to plaster.

As long as you do not have a cement grouted tile waterline, you are fine.

 

[jhenson67]

Ty

 

[jhenson67]

Thanks for all your help. it’s a work in progress until I get in a routine

 

[jhenson67]

The GA sun is eating my FC. It’s been a week since I got rid of the mustard algae, or whatever it was, and the pool has been crystal clear. Every evening I’m having to dispense 1/2 gallon of 12.5% LC. By the time I get home the next day the level is down to 1-2. I’m using the FAS-DPD test method. CC is .5, Cya is 70. I’m aiming to get the cya down to 50 with water replacement. It’s going slow cause I can’t drin below the skimmer box.
Question: is this normal for the sun to eat that much FC?
Ph= 7.6, TA= 90

 

[mknauss]

Your signature does not show pool volume. How much FC are you adding each day?

 

[zimdogg]

When you add the 1/2 gallon of chlorine to your pool, have you tested to see what that brings FC up to? Might help you confirm how much you're actually consuming. Once you add chlorine retest about 30 minutes later after the pool has had time to circulate.

Most pools eat 2-4ppm of FC per day give or take depending on amount of sunlight and swimmers.

 

[jhenson67]

Ok an hour ago FC was 2.5
I added 36oz of liquid chlorine per pool math
Just tested and it 6ppm
Pool is 8,436 gallon fiberglass

 

[mknauss]

A half gallon of 12.5% a day is 7 ppm FC. You either have no CYA in the water or you have algae.

 

[jhenson67]

It’s probably algae.

 

[jhenson67]

I tested again just now, 2hrs after 36oz of FC and it’s back down to 2.5ppm.

 

[mknauss]

Be sure on your CYA level.

 

[jhenson67]

I’ve tested it 4 times and the dot disappears at 70-60.
I need to get the cya down so I won’t be going thru so much chlorine.
I’m getting frustrated. The 1st couple of months after install were so smooth with no problems.