SLAMming Confused: Deal w CYA First? What is “SLAM Level”?

[PoolStored]

Gave it a rest over night. Exchanging again now that I can keep an eye on it periodically. I'm curious what you mean by "no going back" once the pump has been turned on. Thanks.

You should do this in one exchange without running the pump. The water is stratifying based on temperature and TDS. You are putting new water on top in shallow and removing water from the deep end. If you stop (and particularly if you run the pump), the water has a chance to mix, reducing the effectiveness of removing old water and adding new.

Example: CYA=100. Let's say you did 10% exchange and stop. You mix. Your CYA is now 90. Then you exchange another 10%, it will only reduce it by 9, so you would be CYA 81.

If you had done the 20% in one shot, you would be at 80.

It's just recommended that you do it in one exchange to be efficient. Don't fret over it, you are doing great.

 

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interestingly, I can now see the pool drain for the first time since last fall.

 

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Why would that be so, in terms of chemistry? Or is it simply that bad water is going out and fresh water is going in, as I suspect?

Thanks.

 

[PoolStored]

Why would that be so, in terms of chemistry? Or is it simply that bad water is going out and fresh water is going in, as I suspect?

Thanks.

You are removing water that is cloudy and replacing with clear water. Great progress!

 

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Latest update and questions:

Stopped the water exchange. Backwashed & rinsed the sand filter. Going to check CYA this evening just to see where things stand. Meanwhile, should I:

1/ Turn on the salt generator?

2/ Use the robot vacuum and/or our Pool Blaster?

3/ Recite any incantations and/or offer sacrifices to the pool gods? If so, please advise the nature of each.

Thank you.

 

[HermanTX]

Latest update and questions:

Stopped the water exchange. Backwashed & rinsed the sand filter. Going to check CYA this evening just to see where things stand. Meanwhile, should I:

1/ Turn on the salt generator?

2/ Use the robot vacuum and/or our Pool Blaster?

3/ Recite any incantations and/or offer sacrifices to the pool gods? If so, please advise the nature of each.

Thank you.

There is no need to turn on SWCG as you will be adding liquid chlorine to SLAM
Definitely could vacuum and debris
Pray to Poseidon.

Note; read SLAM process - verify your pH before adding chlorine.

 

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There is no need to turn on SWCG as you will be adding liquid chlorine to SLAM
Definitely could vacuum and debris
Pray to Poseidon.

We have a Goldendoodle. Is an offering necessary?

 

[PoolStored]

We have a Goldendoodle. Is an offering necessary?

A chewy box.

 

[PoolStored]

Going to check CYA this evening just to see where things stand.

Turn on the pump.

Add 5ppm of liquid chlorine to keep algae at bay. Tonight and tomorrow noon if you can. Keep pump running if you can...we want that mixed, throw in the dolphin to help mix too.

Don't test CYA for 18-24 hours. Check CYA Tomorrow afternoon might be ok too, then start the slam.

 

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There is no need to turn on SWCG as you will be adding liquid chlorine to SLAM
Definitely could vacuum and debris
Pray to Poseidon.

Note; read SLAM process - verify your pH before adding chlorine.

Thanks for the reminder in the ph.

 

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Turn on the pump.

Add 5ppm of liquid chlorine to keep algae at bay. Tonight and tomorrow noon if you can. Keep pump running if you can...we want that mixed, throw in the dolphin to help mix too.

Don't test CYA for 18-24 hours. Check CYA Tomorrow afternoon might be ok too, then start the slam.

Wait... don't test the CYA before I add the liquid chlorine? Why not, to get a target?
And can you explain the 5 parts per million? How do I calculate that?

 

[PoolStored]

Wait... don't test the CYA before I add the liquid chlorine? Why not, to get a target?

You likely have 40-50CYA in the pool with the exchange. With the new water and the old mixing, you want some chlorine to keep algae at bay until you get to the SLAM. Without it, you are just giving algae more time to grow. Even with a CYA of 20, 5ppm is still within target.

 

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You likely have 40-50CYA in the pool with the exchange. With the new water and the old mixing, you want some chlorine to keep algae at bay until you get to the SLAM. Without it, you are just giving algae more time to grow. Even with a CYA of 20, 5ppm is still within target.

Color me confused.

I shouldn't check the chlorine first?

And, based on me asking ChatGPT "please calculate the amount of 10% liquid chlorine you need to add to your 22,000-gallon pool to achieve a 5 ppm concentration," I get the following answer:

"You would need to add approximately 11 gallons of 10% liquid chlorine to your 22,000-gallon pool to achieve a 5 ppm concentration. Remember to follow the manufacturer's instructions and safety guidelines when handling and adding chemicals to your pool."

Is that correct?

 

[PoolStored]

Color me confused.

I shouldn't check the chlorine first?

In general yes, in this situation, not really necessary. Your logs are two days old (10FC). I assumed that with organics, daily loss and a water exchange...you are close to zero. Without the water being mixed FC test will not be valid. 5ppm will not hurt your pool. It will help keep any algae at bay. You have the CYA for it...

And, based on me asking ChatGPT "please calculate the amount of 10% liquid chlorine you need to add to your 22,000-gallon pool to achieve a 5 ppm concentration," I get the following answer:

"You would need to add approximately 11 gallons of 10% liquid chlorine to your 22,000-gallon pool to achieve a 5 ppm concentration. Remember to follow the manufacturer's instructions and safety guidelines when handling and adding chemicals to your pool."

Is that correct?

No, use pool math, not chatGPT. Link-->PoolMath
Function within called "effects of adding"

A gallon of 10% is the perfect amount. Will raise your FC by 4.5.

 

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Yes. Your logs are two days old. I assumed that with organics, 10FC and a water exchange...you are close to zero. Without the water being mixed FC test will not be valid. 5ppm will not hurt your pool. It will help keep any algae at bay. You have the CYA for it...

No, use pool math, not chatGPT. Link-->PoolMath
Function within called "effects of adding"

A gallon of 10% is the perfect amount. Will raise your FC by 4.5.

Thank you. Will check poolmath.

 

[PoolStored]

poolmath

Really can't manage a pool effectively without it, or at least is is harder without. Also REALLY helpful for a SLAM calculating additions.

 

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Thank you. Will check poolmath.

 

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I use the mobile version. There's no PPM under Effects of Adding. And only possible to start with amount added rather than a target.

Putting in 1 gal only returns that is raises the FC by 4.5 and the Salt by 7.5. No indication what these mean.

Help?

 

[PoolStored]

I use the mobile version. There's no PPM under Effects of Adding. And only possible to start with amount added rather than a target. Help?

Select "Bleach" for chemical and 10% (or whatever you have). Adjust the amount until you see "Raise FC by X.X" Where X.X is how many ppm you want to add to pool.

 

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Select "Bleach" for chemical and 10% (or whatever you have). Adjust the amount until you see "Raise FC by X.X" Where X.X is how many ppm you want to add to pool.

Thanks. Would be helpful for the developer to add the particular measurement they're referring to there...