Greater dilution possible with FC test during SLAM?

xcfmx

Member
Jul 27, 2019
11
Houston, TX
First time poster here. I'm currently midway through a SLAM on my pool with an FC target of 20 and testing multiple times a day. I have a Taylor K2006 test kit. Right now I'm testing FC with a 10ml pool water sample and each drop indicates 0.5ppm FC. Has anyone further reduced this to a 5ml sample and then each drop would indicate 1ppm FC? I'm trying not to burn through all of my test kit in the first week and don't need 0.5ml accuracy until the OCLT.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,067
Northern NJ
Welcome to TFP.

Yes, some folks have used a 5 ml sample to conserve reagent. You have less accuracy and greater error so I would shoot to see 22ppm if my target was 20 ppm to error on the high side and ensure you have at least your SLAM FC level.
 
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xcfmx

Member
Jul 27, 2019
11
Houston, TX
Welcome to TFP.

Yes, some folks have used a 5 ml sample to conserve reagent. You have less accuracy and greater error so I would shoot to see 22ppm if my target was 20 ppm to error on the high side and ensure you have at least your SLAM FC level.
Thanks for the quick reply! I figured it was doable, but wanted confirmation before I did it.
 

duraleigh

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Apr 1, 2007
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Sebring, Florida
I would order extra reagent. Perform the test at normal resolution and absorb the cost. In the long run. it's chump change.
 

PoolBrews

Well-known member
Oct 16, 2019
199
The Villages, Florida
Perhaps a note should be added to the SLAM process page warning folks to order extra FAS/DPD and DPD powder in preparation for SLAM. I'm in the same boat - never thought I would use this much FAS/DPD drops.

I got my order in and should receive to tomorrow... but only have enough drops left for probably one more test before it arrive tomorrow afternoon.
 
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duraleigh

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I use the 5ml sample and 1 drop per 1 ppm FC when I have done slam. Works fine.
Done correctly, a SLAM requires .5 resolution......you cannot get that unless you use a 10ml sample.