Some pools do seem to always have minor CC issues.
I think this describes my pool, assuming the test results are accurate.
Does your pool get a bunch of shade or tree debris falling in to the pool?
Yes. This pool is 70% shaded all day every day, and quite a bit of "stuff" seems to jump off the overhead Live Oak tree and land in the pool, mostly ferns and leaves and small bugs and such. I skim it out manually a couple times a day but there is always something in there the next time I go out and look at it. I plan to build a frame over the pool and stretch a tarp over it to keep most of the tree stuff out, but I won't be able to build it until this weekend at the earliest.
If you could, please post up your FC and CYA results too.
TA = 70-80 ppm
CYA = 40-50 ppm
FC = 6.0 ppm
CC = 0.5 ppm
Borates = 40 ppm (based on poolmath)
Try once with 25 mL and see what you get. If it really is staying at .5 ppm, you might have something trying to get started.
Will do.
You may have a lot of debris in the pool which will lead to CC's. What is your FC target and how much is lost everyday?
My target range for FC is 5.0 - 7.0 ppm. My plan is to add bleach the moment my FC drops to 5.0 -- enough to bring it up to 7.0 again.
I don't know how much FC is lost every day because I have not been monitoring it. Mostly for the past 2-3 weeks I have been working to bring my TA down and my CYA up to the levels suggested for the addition of borates. During this period my FC was at shock level a couple times because I added more dichlor than I should have. But now that my CYA level is on target and I have added most of my borates, I will start monitoring my daily FC loss.
Typically I get just the faintest bit of pink with the addition of the R-0003. It immediately goes clear with a single drop of titrant.
This is precisely what happens every time I have done the CC test with 10ml. So based on the suggestions here I'm going to run the CC test using 25 ml just to see what I get.
I've gone through periods where I show CC at every test for weeks and then somehow it goes away again for a while..
So seeing low CC numbers is not unusual I guess. Thanks Richard.
It could be something as simple as debris in the skimmer or pump strainer or superfine stuff in the filter.
Or stuff from the tree!
Your chlorine could be trying to oxidize some organic debris that isn't algae.
I have never seen any indication of algae, but maybe the consistent (yet not overwhelming) "raining down" of stuff from the tree will always keep my CC higher than zero ... at least until I get my canopy / cover built.