Best time to start slamming

mnhim001 · Sep 11, 2022

Hi Guys,

I am going to start slamming, but just wondering the best time of day to do this?

CYA is between 30-40
FC = 1
CC = .5
PH = 7.8, just added some muriatic acid to lower it to 7.2

ajw22 · Sep 11, 2022

Whenever you get to it. Time of day does not make a difference. Get it going.

For CYA 40 your SLAM FC is 16.

mnhim001 · Sep 11, 2022

ajw22 said:
Whenever you get to it. Time of day does not make a difference. Get it going.

For CYA 40 your SLAM FC is 16.

Perfect, thank you.

mnhim001 · Sep 12, 2022

My FC has gone up, but my CC has been only at .5, is it normal during a slam or should it be higher?

ajw22 · Sep 12, 2022

mnhim001 said:
My FC has gone up, but my CC has been only at .5, is it normal during a slam or should it be higher?

CC is only one possible indicator of algae.

CC - Further Reading

www.troublefreepool.com

mnhim001 · Sep 12, 2022

ajw22 said:
CC is only one possible indicator of algae.

CC - Further Reading

www.troublefreepool.com

But, is .5 CC normal during a slam? I am expecting it to be higher.

ajw22 · Sep 12, 2022

mnhim001 said:
But, is .5 CC normal during a slam? I am expecting it to be higher.

You can have algae with 0 CC.

CC is only one indicator of algae.

mnhim001 · Sep 12, 2022

ajw22 said:
You can have algae with 0 CC.

CC is only one indicator of algae.

I am sorry, I am not understanding your comment.

So, what CC should I be seeing during a slam? I understand that I have algae, that is the reason why I am doing the slam.

ajw22 · Sep 12, 2022

Whatever CC you have is the way it is for your pool now. every pool is different.

Do you meet the 3 exit criteria for the SLAM process?

CC is 0.5 or lower
AND you pass an OCLT (i.e. overnight FC loss test shows a loss of 1.0 ppm or less)
AND pool water is crystal clear with no visible sign of algae (dead or alive) on floor and walls

When all three are true, you are done SLAMing and can allow the FC to drift down to normal levels.

mnhim001 · Sep 12, 2022

ajw22 said:
Whatever CC you have is the way it is for your pool now. every pool is different.

Do you meet the 3 exit criteria for the SLAM process?

CC is 0.5 or lower

AND you pass an OCLT (i.e. overnight FC loss test shows a loss of 1.0 ppm or less)

AND pool water is crystal clear with no visible sign of algae (dead or alive) on floor and walls

When all three are true, you are done SLAMing and can allow the FC to drift down to normal levels.

I see, but during the whole slamming process (been only 24 hours) my CC has always been 0.5.

ajw22 · Sep 12, 2022

mnhim001 said:
I see, but during the whole slamming process (been only 24 hours) my CC has always been 0.5.

That is fine.

Why are you slamming?

Did you fail a Overnight Chlorine Loss Test?

Was your pool cloudy?

mnhim001 · Sep 12, 2022

ajw22 said:
That is fine.

Why are you slamming?

Did you fail a Overnight Chlorine Loss Test?

Was your pool cloudy?

Pool was cloudy. I am going to do the overnight test tonight.

IceShadow · Sep 12, 2022

If your CC is over 0.5 you have an issue and a SLAM is recommended to resolve.

If your CC is 0.5 or less, you may or may not have an issue. CC is different in every pool, in every situation. CCs are not automatically created / building up when algae is being killed. Sometimes they dissipate to the sun and such as soon as they're made. High CCs are typically more a byproduct of ammonia or ammonia products interacting with FC - elevated CC typically means biological ammonia waste in the pool (someone peed in it) or other ammonia sources. The link Allen posted upthread has an explanation of why oxidizing algae doesn't usually make CCs.

Britali · Sep 12, 2022

mnhim001 said:
I see, but during the whole slamming process (been only 24 hours) my CC has always been 0.5.

Which means you passed one of the criteria (for even if it has been from start) but still need to pass OCLT & not cloudy.

mnhim001 · Sep 12, 2022

Britali said:
Which means you passed one of the criteria (for even if it has been from start) but still need to pass OCLT & not cloudy.

Got it. Thanks.

mnhim001 · Sep 12, 2022

IceShadow said:
If your CC is over 0.5 you have an issue and a SLAM is recommended to resolve.

If your CC is 0.5 or less, you may or may not have an issue. CC is different in every pool, in every situation. CCs are not automatically created / building up when algae is being killed. Sometimes they dissipate to the sun and such as soon as they're made. High CCs are typically more a byproduct of ammonia or ammonia products interacting with FC - elevated CC typically means biological ammonia waste in the pool (someone peed in it) or other ammonia sources. The link Allen posted upthread has an explanation of why oxidizing algae doesn't usually make CCs.

Thanks for explaining it more clearly.

mnhim001 · Sep 16, 2022

I Just finished slamming my pool and everything looks great!! Thank you all for the help.

My next question is...do I want for the FC to get back to normal levels or can I start balancing the TA? My TA is at 220ppm right now.

mknauss · Sep 16, 2022

mnhim001 said:
I Just finished slamming my pool and everything looks great!! Thank you all for the help.

My next question is...do I want for the FC to get back to normal levels or can I start balancing the TA? My TA is at 220ppm right now.

Once the FC is at or below 10 ppm, then the pH test is valid. At that time, adjust the pH into the 7's. Test pH every other day and lower the pH to 7.2 or so.

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