How pink is pink when reading CC

[Adamphotoman]

Sometimes the DPD reagent #3 gives a very slight pink. Other times it is more pronounced but regardless 1 drop of R-0871 always clears it up.
Obviously there is less CC or more CC but always 1 drop.

 

[Dirk]

I know what you mean. Technically the test result is determined by when the color disappears, not how vivid that color was before it does. But in my head, the lighter the pink the less I worry about CC! Regardless, if you never use more than one drop to get to clear, that's 0.5 or less and not something to address. But I like to see clear from the start, so if I see any pink at all, I'll test CC a little more often than I would otherwise. Pink is telling me that it might be just something that happened in my water that morning, or is something to keep an eye on (which I then will). It seems to be about 50-50 in my pool. Half the time I get no pink, half the time a get a faint pink. I've only needed an extra drop one time (so that was a 1.0 day).

 

[Adamphotoman]

Yes, and I keep the pool covered until swim time. So I have to lift the cover to get a sample to test. If it was very very very faint I will call it CC 0. If it was quite pink I will call it CC.05

 

[Dirk]

Hmmm, I have a very vague recollection that sunlight and CC are tied together somehow. So a pool cover might affect that. Maybe my guru @mknauss has the answer to that.

 

[Richard320]

CC will burn off in sunlight. If the pool stays covered all the time it will accumulate.

But as long as CC is .5 or less, just treat it as zero. Pale pink or Barbie pink, doesn't matter. As long as one drop clears it, it's good.

 

[Dirk]

Thanks Richard!