Elevated CC but no overnight chlorine loss

[incredible-bulk]

Following on from my previous thread where i had CC (1-1.5ppm) and no obvious cause. It was suggested that I may have some algae hiding somewhere. Sure enough i found some in the creases of the liner. The water is otherwise crystal clear, just showing CC in my tests. I brushed thoroughly in the creases of the liner and dislodged the algae, it wasnt a lot but it was there. Ive maintained the regular brushing and havnt seen algae since.

I havnt had time to perform a SLAM and I believe thats why my CC is still above 1ppm? I did an overnight chlorine test last night and the results were:

21:22 last night

FC - 4.36ppm

05:30 this morning

FC - 4.02ppm

Is this indicative of anything? Should i still do a SLAM to bring the CC down? The no overnight FC loss, does that suggest that i have potentially remedied the initial cause of the CC?

Above ground pool, sand filter and all other parameters within ideal ranges on pool math.

Thanks.

 

[Texas Splash]

In general, with no overnight chlorine loss I would say you're probably good for now. The elevated CCs could simply be due to lack of adequate sunlight to oxidize the CCs. I would maintain normal FC levels for now and monitor. If any of that junk reappears in the vinyl, then I would go right into the SLAM Process.

Your signature is blank though. Can you confirm which test kit you are using? You probably can't get a TF-Series test kit or Taylor K-2006C over there, but it would be nice to know. Consider updating that and all of your pool/equipment info into your signature for future reference. See my signature as an example.

Create Your Signature - Further Reading

www.troublefreepool.com

 

[Mdragger88]

Following on from my previous thread where i had CC (1-1.5ppm) and no obvious cause. It was suggested that I may have some algae hiding somewhere. Sure enough i found some in the creases of the liner. The water is otherwise crystal clear, just showing CC in my tests. I brushed thoroughly in the creases of the liner and dislodged the algae, it wasnt a lot but it was there. Ive maintained the regular brushing and havnt seen algae since.

I havnt had time to perform a SLAM and I believe thats why my CC is still above 1ppm? I did an overnight chlorine test last night and the results were:

21:22 last night

FC - 4.36ppm

05:30 this morning

FC - 4.02ppm

Is this indicative of anything? Should i still do a SLAM to bring the CC down? The no overnight FC loss, does that suggest that i have potentially remedied the initial cause of the CC?

Above ground pool, sand filter and all other parameters within ideal ranges on pool math.

Thanks.

What is your cya?

 

[incredible-bulk]

In general, with no overnight chlorine loss I would say you're probably good for now. The elevated CCs could simply be due to lack of adequate sunlight to oxidize the CCs. I would maintain normal FC levels for now and monitor. If any of that junk reappears in the vinyl, then I would go right into the SLAM Process.

Your signature is blank though. Can you confirm which test kit you are using? You probably can't get a TF-Series test kit or Taylor K-2006C over there, but it would be nice to know. Consider updating that and all of your pool/equipment info into your signature for future reference. See my signature as an example.

Create Your Signature - Further Reading

www.troublefreepool.com

Thanks for the info, sorted out my sig.

What is your cya?

Approx 50 ppm. Palintest dot method.

 

[Mdragger88]

You’re running right at minimum fc for your cya. This is asking for algae/issues. Target fc is 6-8 ppm.
FC/CYA Levels
Ideally you would target 8ppm or a scootch higher so if your daily loss exceeds the average 2-4ppm you’re covered until your next dose. You can try just running at target fc & see if that makes a difference. Also, clean your testing beaker/vessel with alcohol & see if that helps.
If the elevated cc’s don’t go away at adequate fc levels or you get cloudy water/see visible algae it’s definitely SLAM Process time.

 

[incredible-bulk]

Hi, I was thinking just that. Weather has been terrible here, absolutely chucking it down. Ive just finished off the last of a bucket of cal hypo. That will take the FC to approx 9.5ppm and moving forward I’ll be aiming at 8ppm maintenance level.

Incidentally, before upping the FC, i checked the CC and it was down to 0.73ppm. Water still beautiful despite the miserable rain.

 

[Mdragger88]

Hi, I was thinking just that. Weather has been terrible here, absolutely chucking it down. Ive just finished off the last of a bucket of cal hypo. That will take the FC to approx 9.5ppm and moving forward I’ll be aiming at 8ppm maintenance level.

Incidentally, before upping the FC, i checked the CC and it was down to 0.73ppm. Water still beautiful despite the miserable rain.

Great - use liquid chlorine for daily chlorination going forward. Low ch isn’t a concern for vinyl pools but high ch is a problem for all pools.

 

[incredible-bulk]

Cal hypo is much easier to get hold of here. Last CH reading 7 days ago was 207ppm. Pool math suggests upping that with calcium chloride but i guess that is not necessary?

 

[Mdragger88]

Correct- no need. But yes, you do have a little wiggle room.
If you have vinyl selected in poolmath you will see it says ideal is as low as 50ppm & recommended is as low as zero. Switch on CSI tracking - you want your csi .3 or less.