Cleaning the FAS-DPD scoop

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LoneWolfArcher said:
Copper cyanurate? Do you have a pool heater? Or added any algicide?
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Yes I added algaecide. No heater. Roughly 3 weeks ago when I was starting the ascorbic acid treatment I added 16oz of kemtek 60%

Wobblerlorri said:
Are you rinsing out your vials with plain tap water after every use? And not just gently rinsing -- blast that water in there! You need to thoroughly rinse all your vials vigorously with plain tap water after use. In fact, best practices for water labs has you rinsing the labware with the sample water before use, too. But we don't need to be that precise.


You can put some warm water with a drop of dishwashing detergent in your vial, then let it sit and soak for an hour or two. Then scrub it out with some paper toweling wrapped around your little finger. Rinse, rinse, rinse. The vial will have a definite sparkle when it's clean.


If that doesn't work, you'll need a new vial.
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Yes I rinse the vials/tube several times after each use. I tried to clean with bleach but it didn't work. I didn't actually get in there with a cue tip but I try again.
 
anthony21078 said:
Yes I added algaecide. No heater. Roughly 3 weeks ago when I was starting the ascorbic acid treatment I added 16oz of kemtek 60%
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Made the mistake of algaecide last year. And then my CYA was up around 200. By the end of swimming season I had purple forming on my skimmer basket, on my floating chlorinator, and on my filter cartridge. Copper and CYA create copper cyanurate which is purple. Some people have had their entire pool turn purple.
 
LoneWolfArcher said:
Made the mistake of algaecide last year. And then my CYA was up around 200. By the end of swimming season I had purple forming on my skimmer basket, on my floating chlorinator, and on my filter cartridge. Copper and CYA create copper cyanurate which is purple. Some people have had their entire pool turn purple.
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I don't see the mistake? I needed to add algaecide because I had to bring FC to zero for 2 days to treat with ascorbic acid. My CYA is at 40 right now
 
I found out by accident that cleaning carefully after doing the FAS-DPD test is really essential if you do the pH test next. Any contaminents in the test tube from the FAS-DPD test will make the pH read super high. To help, I now also always do the pH test first.
 
Flying Tivo said:
The K2006 has 2 test tubes and the PH comparator. Why are you using the comparator for FC ??
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It has two "test tubes" joined together into one piece of plastic which also incorporates the pH color chart. The smaller tube is used only for the CYA test. The larger tube, marked at 10ml, 25ml, and 45ml points, is used for everything else. The FC and the PH tests both use the large tube.
 
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