Hopefully...minor clarity issue

[Watermom]

I deleted your other post with the incorrect numbers. BTW -- when you realize soon after you make a post that you need to correct something, instead of posting another post, you can go in and EDIT it. Just click on the blue edit button in the lower right corner of the post. There is a time frame where you can do this, but I can't remember how long it is.

[buki5]

So, I think my basic question is what is my chlorine level range where everyone is able to swim and Algae is being held off (water clear)?

8-10 or 8-something higher? I believe I've seen on here at my CYA levels I need to stay at 8 or above to keep algae at bay? But how high is still safe for swimming?

[Watermom]

Take a look at this version of the "best Guess CYA chart." You must maintain cl between 8-15 all the time with your cya level. Swimming in a higher chlorine level pool is less of an issue if the cya is also high. I don't think there is a magical "cut-off" number. But, I'd probably wear an old swimsuit.

http://www.poolforum.com/pf2/faq.php...aq_bg_chlorine

[buki5]

Perfect. Thanks. I've referred to the Best guess table a number of times. So, I think I can do that. And yes will likely drain sooner rather than later....then I get to start the chemistry all over again.

[Watermom]

then I get to start the chemistry all over again.

We'll be in your back pocket helping then, too! Have fun swimming this weekend!

[chem geek]

Losing more than 50% of the FC in a day with a very high CYA level means you've got more than just loss from sunlight. You could check the overnight chlorine loss, but I suspect you've got nascent algae growth even if it isn't visible -- again, if the CYA reading is truly as high as reported.

Usually even in very hot sunny weather the chlorine loss will be around 15% in a day when the CYA is 100 ppm or so. At 60-80 ppm it may be around 20-25% FC drop while at 40-50 ppm it may be up to 50% and at 20-30 ppm it could be up to 60%. Higher CYA levels have lower chlorine loss rates even when proportionately keeping the FC higher. It may have to do with some direct CYA shielding effect protecting lower depths from sunlight.

[buki5]

Thanks again all.

I've been testing CL levels at least 2 times a day to understand what is happening. The run down of the last 20 hours or so is this. Weather is Sunny and warm.

Last night added the extra bleach suggested by Watermom. I was at 11.05 plus another bottle which should have taken me to around 14.5. Checked this morning before work (left pool open overnight) and measured around 14. Covered the pool for the day, came home and measured again (about 11 hours) and got a 12.5. Kids swam, dog swam, I swam (2.5 hours passed, I checked CL again and measured 8.5. Added 2.84 gal 6% and leaving open overnight. Will measure before I go to bed later and expect a 14.5 to 15 reading. Will check again in the morning. My money says it will be in range of 13 to 13.5 then when I get home am expecting around 11.

Will keep you posted.

[buki5]

I'm going to continue my thread from last year (my first with a pool). Year 2 here we go.

This year getting ready to go. If you look through the notes for last year you will see super high CYA. I drained and filled for 3 days and about 8 hours this year guessing around 18000 gallons.

Took my first full set of numbers and am concerned about the TA level. Here you go.

FC 7
CC 0
TC 7
PH 7.6
TA 60 **
CH 110
CYA something <30
Temp 64 deg F

From the Balance scale in my K-2006 it seems I'm way negative on my balance. Should I be concerned? If so what are the steps to correctly adjust. I'm planning on burning off the CL (Targeting 4) and will bring my CYA up to around 35 and raise temp to around 82 deg.

Fill water is City Tap.

For reference I was burning through around 1 large 6% bottle a day last year. Chemicals will be almost free this year in comparison .