Taylor Cyanuric Test Reading

[houstonTex]

I'm having another small algae issue and wanted to see if anyone else here would care to verify my CYA reading of 45. I'm chlorinating based on a 45 CYA reading and wondering if I'm off a bit. See attached images.

[attachment=2:2pr3fzk9]CYA55_small.jpg[/attachment:2pr3fzk9]

[attachment=1:2pr3fzk9]CYA50_small.jpg[/attachment:2pr3fzk9]

[attachment=0:2pr3fzk9]CYA45_small.jpg[/attachment:2pr3fzk9]

 

[Richard320]

Even at 55 I still see the dot.

When I take the reading - and remember, this is just me - I hold the view tube with thumb and one finger at waist level, in full sunlight but shaded so I don't get glare off the top surface. When i used the 50 ppm standard solution, I'm right on the money.

Also remember to pour your sample back, mix it again a little, and take another reading, as many times as it takes to get consistent readings. If it's within about 5 ppm, use the higher reading. A little extra bleach every day has got to be cheaper than the full-on shock process.

 

[houstonTex]

Yeah, I definitely see the dot at 55, but at 45 I also can see the dot very faintly. Below is the 45 again under direct full sun (instead of the previous 45 image I sent which was indirect full sun).

[attachment=0:hqb8vtli]CYA45_sun_small.jpg[/attachment:hqb8vtli]

 

[UnderWaterVanya]

I also see the dot at 45. I have poor vision due to retinal detachments and high astigmatism and the start of cateracts... but I still see that dot. It's really hard NOT to see it. But I'd rather err on the high side like Richard says...

 

[houstonTex]

Right, I agree. So I guess my original post was to get feedback on the question - "I can see the dot disappearing from about 55ppm all the way down to like 20ppm, so how much CYA do I really have?" I can keep convincing myself that I can see the dot over a pretty wide range, but I know that match and chemistry tell me that I should have roughly 50ppm CYA. Is my "standard" for a dissapeared dot different that what the rest of you consider it?

 

[Richard320]

Right, I agree. So I guess my original post was to get feedback on the question - "I can see the dot disappearing from about 55ppm all the way down to like 20ppm, so how much CYA do I really have?" I can keep convincing myself that I can see the dot over a pretty wide range, but I know that match and chemistry tell me that I should have roughly 50ppm CYA. Is my "standard" for a dissapeared dot different that what the rest of you consider it?

It's a very subjective test.

The bottom line is: the dot should be gone. Period. Invisible. No idea it was ever there. Tilting your head side-to-side doesn't change it. Try looking away for a brief bit to get the image to go away, then look again.

Or order up a bottle of the 50ppm standard solution the next time you order refills and check yourself. If you aren't getting pool-stored, you ought to have enough cash to afford it now!

 

[houstonTex]

So your subjective eyes agree that I have less than 45ppm then?

 

[Richard320]

So your subjective eyes agree that I have less than 45ppm then?

Yes.

 

[Bama Rambler]

I agree that it's less than 45 too.

 

[houstonTex]

Thanks guys. Sorry to belabor the topic, I just wanted to be sure.