Cant get rid of CC

[Luric]

We had a mustard algae outbreak last weekend which I treated with the SLAM/Mustard SLAM process (so much brushing!) Everything looks clear, and we passed the ONCL test last night/this morning...but I can't get rid of the CC. Do I just need to give it more time or do I need to spike my levels again? We have a party Friday night, so I need to be able to get my FC levels to a reasonable number by then.

FC: 18
CC: 1
pH: 7.5
TA: 60
CH: 325
CYA: 40

On a slightly related note, should I start upping my CYA to my salt generator level or keep low incase I need to SLAM again? If I keep it low should I stick with LC or can I use my salt cell? If I use salt cell should I adjust schedule to acct for lower CYA?

THX!!

 

[Texas Splash]

I suppose the first question any of us would ask is .... Has your CC been elevated like this the entire time? A CC of 0.5 or less is one of the regular SLAM passing criteria. If it never dropped below 1 ppm you never actually passed the SLAM.

 

[PoolStored]

If you have CC, then SLAM is in order.

On a slightly related note, should I start upping my CYA to my salt generator level or keep low incase I need to SLAM again?

I would not, you need to SLAM.

If I keep it low should I stick with LC or can I use my salt cell? If I use salt cell should I adjust schedule to acct for lower CYA?

Use LC for the SLAM. Yes, when you are done, you should adjust pump schedule or cell output to generate enough chlorine to keep your FC in target range for your CYA Link-->
FC/CYA Levels

 

[Newdude]

We have a party Friday night, so I need to be able to get my FC levels to a reasonable number by then.

SLAM is safe for all swimmers and equipment. (Providing the pool is clear enough for swimmer rescue).

You'll be the only one who knows.

 

[Luric]

If you have CC, then SLAM is in order.


I would not, you need to SLAM.

Use LC for the SLAM. Yes, when you are done, you should adjust pump schedule or cell output to generate enough chlorine to keep your FC in target range for your CYA Link-->
FC/CYA Levels

Regular level or elevated level? Should I do it now (9am) or wait till evening to lose less chlorine?

 

[Luric]

I suppose the first question any of us would ask is .... Has your CC been elevated like this the entire time? A CC of 0.5 or less is one of the regular SLAM passing criteria. If it never dropped below 1 ppm you never actually passed the SLAM.

I've done so much testing but if I'm recalling, yes I think it has always been at 1, not higher or lower.

So I'll SLAM again - regular level or elevated mustard level? Should I do it now (9am) or wait till evening to lose less chlorine?

 

[mknauss]

Be sure to clean the test vial with alcohol or straight bleach.

 

[PoolStored]

Regular level or elevated level? Should I do it now (9am) or wait till evening to lose less chlorine?

SLAM level for your CYA (FC/CYA Levels). I would get on it. The more you check and replace the faster it goes. Good luck!

 

[Luric]

With a CYA of 40 my SLAM level should be 16. My current FC is above that at 17 and I still have CC. So what now? Should I slam at a 50 CYA level since that test can be difficult to read?

 

[PoolStored]

Did you clean your test vial with alcohol as Marty suggested? Do that and retest FC and CC.

 

[Luric]

Did you clean your test vial with alcohol as Marty suggested? Do that and retest FC and CC.

Solved! I just washed out my cylinder with bleach, and not only did it get rid of that dark overcast residue, but I retested and my FC level is still the same (actually 1 drop higher?) but the CC was 0, or maaaaybe 1 drop needed if I stare really hard.

I’ve never heard of needing to rinse out the cylinders, but this is something I’ll definitely add into my maintenance routine moving forward.

So we’re all in agreement that it sounds like I can start drifting back down to my target level? I’ll probably still do a chlorine loss tonight because I’m paranoid, but I shouldn’t need to spike my chlorine again?

 

[mknauss]

From our Extended Test Directions. FAS-DPD
Over time, it is common for a cloudy residue to build up on sample tubes used for FAS-DPD chlorine testing. The residue can be removed by filling the sample tube with bleach, letting it sit for several minutes, rinsing, and then wiping thoroughly with a paper towel.

 

[Pauls234]

I was interested in this because a consistent CC of 1 is pretty unusual in the context of a good old algae SLAM. I've never cleaned out my cylinder but will do so today. Glad it was resolved!