Trouble getting CC to zero.

[chem geek]

Donya,

I'm glad you got your CC cleared up. Did you ever try measuring CCs soon after adding the PolyQuat and then just before adding it again a week later? Alternatively, if you start using PolyQuat again, let us know if you see the CC showing up again. If you do, then that would be a good indication that PolyQuat may measure as CC. If you don't, then you may have had some persistent combined chlorine that high FC levels got rid of (the high FC levels would very likely get rid of any remaining PolyQuat as well).

Richard

[Pool in Carolina Blue]

Donya,

I'm glad you got your CC cleared up. Did you ever try measuring CCs soon after adding the PolyQuat and then just before adding it again a week later? Alternatively, if you start using PolyQuat again, let us know if you see the CC showing up again. If you do, then that would be a good indication that PolyQuat may measure as CC. If you don't, then you may have had some persistent combined chlorine that high FC levels got rid of (the high FC levels would very likely get rid of any remaining PolyQuat as well).

Richard

Richard:

I just did this and yes, the polyquat was the culprit in my pool. I thought it was the pollen and other airborne debris.

[huskerfan]

Argggggggg- forgot about checking that... but... with no solar blanket on my pool at all - I got my cc down to 0, and it stayed at 0 about 2-3 days while my chlorine level dropped back to normal. Then when my chlorine level was around 6 I put my solar blanket on our pool later in the evening. The next morning I had cc of .5 again (had not added any poly60 at this point). The solar blanket was washed off at the end of last season - then just rolled up on the reel and bungee corded on there and left uncovered over the winter. When I unrolled it to put it on my pool for the first time this year, there was some water accumulated in the roll at the bottom -- so I rinsed off where it was as it had a brownish film on it. So... something from my solar blanket or the pool being covered brought my cc from 0 to .5. I took the solar blanket off yesterday for about 3 hours or so, and pulled a sample to check last night before putting my solar blanket back on or adding my bleach, poly 60, and a tad bit of muratic acid as I've been heavily aeriating to get my alkalinity down. Still checked .5cc. Added my chemicals (bleach, 7oz poly 60, muratic acid) and covered it back up.

Checked it today - cover hasn't been off yet... also -- got my refills for my testing kit from Taylor just a bit ago -- so used all new reagents to check it.

FC 4.2 (using 25ml line)
CC .6
TC 4-5 (hard to tell which)

re-tested again using the 10ml line:
FC 4
CC .5

ph 7.3 to 7.4
alk 150-160 (was previously 180-190 before aeriating)
cya 25-30 (has been testing around 45ish with my old reagent)?? Even tested it a second time with the new reagent to make sure.

So for now will just monitor my levels and keep my chlorine around 5.

Later I'm gonna recheck my cya again - first using my old reagent, then the new again. I'll make sure and keep an eye on my cc in reference to when I added my poly 60 this time and will report back.