Help Identifying Substance in Pool

[pinguy]

Results are in. I have been running my pool pump between 11 AM and 4 PM each day for a couple of weeks now. The SWG is set to max output. My current water temperature is 75 F degrees. The pump had been running 2 hours when I started my testing around 1 PM.

FC : 2.2 (interesting so low given amount of salt and max output of SWG)
CC : 0
PH : 7.6
CYA : < 30 (dot never disappeared)
TA : 60
CH : 80
SC : 4200 ppm (optimum for my SWG) .. salt level for those asking

Fire away!

Your FC is so low because your CYA is low. Your SWG pushing out max chlorine, which is immediately being burned off by the sun.

Bump your CYA up to 30 and SLAM to make sure that you don't have algae. Make sure the SWG is off during the SLAM. After the SLAM, bump the CYA up to 70 and tweak your SWG to keep your FC at a steady 5 or so.

Pool School - Chlorine / CYA Chart

Pool School - SLAM - Shock Level And Maintain

 

[pooldv]

I think it's too soon to call for a SLAM.

Low CYA wins first prize for consuming too much chlorine. Raise it to 30ish for now. Here's how, Pool School - Recommended Pool Chemicals

OCLT wins second prize just to be on the safe side. Here's how, Pool School - Perform the Overnight FC Loss Test (OCLT)

The rest looks good!

 

[JcSparky]

Will do.... raising CYA.

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[pinguy]

I think it's too soon to call for a SLAM.

Low CYA wins first prize for consuming too much chlorine. Raise it to 30ish for now. Here's how, Pool School - Recommended Pool Chemicals

OCLT wins second prize just to be on the safe side. Here's how, Pool School - Perform the Overnight FC Loss Test (OCLT)

The rest looks good!

I never thought about doing OCLT at normal levels, I always associated it with SLAMing. Makes sense.

 

[JcSparky]

You both recommended raising CYA to 30ish .. should it not be closer to 60ish given I have a SWG ?

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[pinguy]

You both recommended raising CYA to 30ish .. should it not be closer to 60ish given I have a SWG ?

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If you fail the OCLT, it's much easier to SLAM with a CYA of 30 than 60. That's why I recommended bringing to to 30 first, then after you confirm you do not have an algae problem you can bump it up to 70.

 

[pooldv]

Pinguy's got you covered on that. Glad everyone is doing some reading around here! Nice work!

 

[JcSparky]

Sounds good ... proceeding to CYA 30.

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[kimkats]

NOW we are on track! Great job everyone!

Kim (must ask for test results better :cop

 

[JcSparky]

Quick update .. 24 hours after adding 2 lbs. of CYA ..

FC : 13.5 (even after overnight)
CYA : 60
PH : 7.8

Thinking my CYA was way below 30, if not 0, I did not think it would rise that high by adding 2 lbs. Anyway I am out of reagent R-187 to test FC with more on the way ..

 

[kimkats]

So how is the water looking now?

Kim

 

[JcSparky]

Water pretty much was clear from the start...just didn't know what the dust/dirt was on the bottom. From reading other posts, I would guess it could've been mustard algea.

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[kimkats]

That is some pretty water there! Nice job! Now keep your FC at your FC/CYA level as seen in this chart:

Pool School - Chlorine / CYA Chart

Keep all of your levels like this chart says:

Pool School - Recommended Levels

Kim

 

[JcSparky]

Definitely my intention! Thanks for everyone's assistance thus far.

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