I have an AG vinyl liner, de filter, northstar .5hp Hayward pump, 18x34:

cc- .6 or so
tc- 17
ph- 7.3
alk- 160
cal- 220
cya- 35-40
temp- 68

I've been patiently trying to get my cc to zero, or at least under .5. Last season it stayed around .4, didn't try to shock it out as was told .4 is ok. At the end of the season right before closing I used a different brand of bleach; the store looked up and told me it was 6percent, but after struggling to keep my chlorine regular and cc moving up to .6 I called the co. directly and found it was only 3percent. Long story short - had just a very few brownish slimy spots about dime size that I brushed and got rid of right away - switched to a 6 percent bleach, and due to the lateness of the season and other reasons had to close with a .5-.6 cc. My water was always crystal clear.

I opened to a clear pool on the 23rd of this month, with just a few spots of brownish dust on the pool floor in places. Ph was a tick low so regulated it with 20mule team borax and added 1 qt poly 60. We have iron in our water - so treated it firstly too with pool magnet for the fill water I had to add and let it filter for 3 days before adding chlorine (after I got a zero reading on iron from pool store). At this time my cc was up to 1.25, so I raised my chlorine up to shock level slowly, to 15. I did this for 5 days - a few times it got down to 12 or 13 on me checking it 3x's a day - raised it right away to 15 again. My cc came down to around .6 and it still hangs there. I've brushed once - but nothing to really brush, have run my pool rover plus every day, whether there's anything to pick up or not. Last night I decided to try to jump it up to 19 to overshock in hopes that that would break my cc, but still tests approx. .6. Right now my tc is down to 17. This morning my pool had just a very slight tinge of yellow to it, very, very slight. It is going away. I'm afraid if I would hold my chlorine level that high my iron will fall out. Should I take it back to 15 and check it more often and try to keep it there for a few more days and see if it will break below .5?? It takes too many drops of reagant to test using the 25ml line of pool water to get an exact cc total - so been guessing using the 10ml line. How long can you hold your pool up to shock level without hurting anything?? I'm on my 6th day of shocking now. I'd like to get this nipped in the butt so I can proceed to put my solar cover on and start running my solar panels so we can swim soon. Todays temp is supposed to reach 92, then back to the 70's the rest of the week. Would appreciate anyone's advice on how to get rid of my cc please. Many thanks!