SLAMing: Clear Pool, CC:0, OCLT>1?? Help

[mollyo]

I am SLAMing to start the season. Opened the cover to a pretty clear pool. Vacuumed up the minimal debris.
Pre SLAM testing:
CYA: 60
TA: 70
pH: 7.4

Trying to keep FC at 24 to SLAM. When I do repeat water testing to keep up the FC my CC has consistently been CC: 0.
My OCLT results have been 1.5.
Do I just keep up the SLAM until I get a difference of exactly 1 or less?
Also, when I do a repeat test for FC a few minutes later to confirm my results, I often get a variation of 1 or so. What is the +/- factor for accuracy in these readings?

POOL: 7600 above ground, cartridge filter, SWG

 

[Texas Splash]

Do I just keep up the SLAM until I get a difference of exactly 1 or less?

Correct. Besides the clear water and CCs of 0.5 or less, you want to pass the Overnight Chlorine Loss Test wit no more than 1 ppm loss overnight.

As for the FC test, once you do the test, it's done. If you let the solution sit it will change colors again. Just disregard that.

 

[mollyo]

Correct. Besides the clear water and CCs of 0.5 or less, you want to pass the Overnight Chlorine Loss Test wit no more than 1 ppm loss overnight.

As for the FC test, once you do the test, it's done. If you let the solution sit it will change colors again. Just disregard that.

I do know it will change colors if it sits. What I find frustrating is getting another sample for testing immediately after I do a test, and the second FC test results will vary by one or two points. I am using the speed stir and trying to be consistent, so it I would hope the results would match.

 

[KJB1]

I do know it will change colors if it sits. What I find frustrating is getting another sample for testing immediately after I do a test, and the second FC test results will vary by one or two points. I am using the speed stir and trying to be consistent, so it I would hope the results would match.

I have the same issue, especially at SLAM level. I don’t have a steady hand so I think that may be part of it. Just try to do the test exactly the same every time.

 

[Texas Splash]

What I find frustrating is getting another sample for testing immediately after I do a test, and the second FC test results will vary by one or two points. I am using the speed stir and trying to be consistent, so it I would hope the results would match.

When you say getting another sample, do you mean from the pool itself to do a 2nd test?

 

[mollyo]

When you say getting another sample, do you mean from the pool itself to do a 2nd test?

Yes. I try to be consistent in my testing: get the second sample at same location in the pool just past the filter return, add drops slowly, keep the same white background for good contrast.

 

[KJB1]

Yes. I try to be consistent in my testing: get the second sample at same location in the pool just past the filter return, add drops slowly, keep the same white background

Yes. I try to be consistent in my testing: get the second sample at same location in the pool just past the filter return, add drops slowly, keep the same white background for good contrast.

Sorry I can’t help other than say I have the same issue. Usually only off a drop or 2 out of 20 or more but it’s annoying. Like I said, I have shaky hands so nothing I can do other than recruit the wife or son and they aren’t interested in testing constantly

 

[PoolStored]

All, the best advice, and it took me a while to get, is to a) keep the reagent bottle vertical and 2) SLOOOOOOOW down the dropping of the drops. Not even really a squeeze, more a gently persuasion of the drops. Let them form slowly and drop of their own accord.

I find if I count one one thousand (slowly), drop, two one thousand, drop, I will get consistent drops and results. You want the drops to hang and "fall." This is the method for consistent results. Hope that helps!!!