Newbie advice needed- VERY high CC

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sandj44

Member
May 22, 2020
24
Philadelphia, PA
Hello - I am new to pool care and I want to make sure the advice I was given is correct before adding 14 GALLONS of liquid Cl. Last night I followed the SLAM chart and added 3 gal of liquid. Today I took a sample to Leslies because i thought I was using my new Taylor K-2006 kit wrong when I got a CC reading of 7 ppm. Nope - my Leslie's readings are below and their system recommended I add 14 gal of liquid Cl. Is this correct? Thanks for any advice.

FC = .74
TC = 8.27
CC=7.53
pH = 7.4
TA = 106
Ca Hardness = 208
CYA = 38
Phosphates = 219
 
Hi Sandj44. Take your time with your test kit to get good readings,, and trust them.. I've had mine for a month now and still learning.

We'll also need to know your pool size in gallons in order to recommend the amount of chlorine to add. Maybe it's in your signature but I can't see it on my phone.

Also how does your pool look? Clear and d blue or green and cloudy?
 
mknauss said:
Welcome to the forum!
Post up your test results from this morning. To be honest, I do not even look at pool store test results.
I suggest you read ABC's of Pool Water Chemistry.
Click to expand...
DanF said:
Hi Sandj44. Take your time with your test kit to get good readings,, and trust them.. I've had mine for a month now and still learning.

We'll also need to know your pool size in gallons in order to recommend the amount of chlorine to add. Maybe it's in your signature but I can't see it on my phone.

Also how does your pool look? Clear and d blue or green and cloudy?
Click to expand...
Thanks for the response! It is 21,000 gal (in-ground concrete with a DE filter). It looks blue but with a cloudy haze. Last week it was green and I couldn't see the bottom after vacuuming, so much improved but I obviously have a CC problem to deal with :(
 
sandj, I see you are doing the 25ML test chlorine test, and you will go through a lot of reagent that way. Feel free to use the 10mL test and save some of that reagent.

Just to let you know, I opened my pool a week ago Saturday, and after SLAMing (it took a couple of days), I had a blue cloudy pool. My FC was holding overnight (OCLT) and it was just a matter of the filter doing its job to clear the water! I could see the bottom on Saturday (took one week exactly). I don't know much about DE filters, but you may need to backwash (I think the rule is that when the pressure increases by 25% over clean pressure, then backwash, which means if 8PSI is your clean pressure you are backwashing at 10PSI).

CC typically gets burned off from the sun. Does your pool get a lot of direct sunlight? Also at 35 CYA (round up to 40), you should be keeping FC at 5-7PPM so use Pool Math after testing to add the right amount of Chlorine. (see Marty's response for the SLAM level below).

Also, remember dead algae will fall to the floor of the pool. If you vacuum with your robot cleaner it will likely get stirred up and cause additional cloudiness. I find that if I stick a pvc pipe into the end of my vacuum hose and hover over the dead algae, I can vacuum it up without stirring too much up. It slow and takes time but the results pay off!
 
Great! In the future, use a 10 ml water sample for the FC/CC test. One scoop of powder, then each drop of reagent to clear is 0.5 ppm FC.

You need to follow the SLAM Process. Round up your CYA to 40 ppm. SLAM level FC is 16 ppm for that CYA. Add liquid chlorine to raise your FC to 16 ppm. Pump running from now to the end of the SLAM. Test FC every few hours or at least 3-4 times per day and add liquid chlorine to get back to 16 ppm FC. Only test FC from now until the end of the SLAM.
 
mknauss said:
Great! In the future, use a 10 ml water sample for the FC/CC test. One scoop of powder, then each drop of reagent to clear is 0.5 ppm FC.

You need to follow the SLAM Process. Round up your CYA to 40 ppm. SLAM level FC is 16 ppm for that CYA. Add liquid chlorine to raise your FC to 16 ppm. Pump running from now to the end of the SLAM. Test FC every few hours or at least 3-4 times per day and add liquid chlorine to get back to 16 ppm FC. Only test FC from now until the end of the SLAM.
Click to expand...
Ok great tip about the 10ml water test! Thx. I know this might be a dumb question but how do I know how much Cl to add to get to the 16ppm?
 
You use PoolMath! That is the app, we also have a webpage version - PoolMath

In a 20K pool, it takes a bit over 3 gallons of 10% liquid chlorine to raise your FC by 16 ppm.
 

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LoneWolfArcher said:
sandj, I see you are doing the 25ML test chlorine test, and you will go through a lot of reagent that way. Feel free to use the 10mL test and save some of that reagent.

Just to let you know, I opened my pool a week ago Saturday, and after SLAMing (it took a couple of days), I had a blue cloudy pool. My FC was holding overnight (OCLT) and it was just a matter of the filter doing its job to clear the water! I could see the bottom on Saturday (took one week exactly). I don't know much about DE filters, but you may need to backwash (I think the rule is that when the pressure increases by 25% over clean pressure, then backwash, which means if 8PSI is your clean pressure you are backwashing at 10PSI).

CC typically gets burned off from the sun. Does your pool get a lot of direct sunlight? Also at 35 CYA (round up to 40), you should be keeping FC at 5-7PPM so use Pool Math after testing to add the right amount of Chlorine. (see Marty's response for the SLAM level below).

Also, remember dead algae will fall to the floor of the pool. If you vacuum with your robot cleaner it will likely get stirred up and cause additional cloudiness. I find that if I stick a pvc pipe into the end of my vacuum hose and hover over the dead algae, I can vacuum it up without stirring too much up. It slow and takes time but the results pay off!
Click to expand...
Thank you so much for taking the time to respond to me! I didn't know that CC will get burned off in the sun. I get a moderate amount of sunlight but not alot. I dealt with the dead algae getting stirred up all last week and the week before. Luckily I seem to be almost past that point but tomorrow I will use my manual vacuum and not my robot. Thanks again!
 
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