How much bleach?

[drako4]

If I decide to shock the pool, approx. how much bleach should I put in? As the FC comes down on its own, will the CC as well?

Do I need to test my CYA again at some point?

Cheers

[Watermom]

In your pool, 1/4 of a cup of 6% bleach will raise your cl by 1ppm. With a cya of 40, you should keep your cl between 3-6 all the time and your shock level will be 15. CC will NOT come down as FC does.

Have you used anything besides the dichlor to raise the cya? If not, I wouldn't worry about testing for it again for quite awhile. Maybe sometime in another month or so and maybe in the fall when you get ready to close the pool. The people who have to test for it frequently are those who are using trichlor tabs and dichlor powder to shock with.

[aylad]

I'm willing to bet that if you'll just leave the pool uncovered for awhile during the day, that CC will disappear without shocking the pool. Otherwise, your numbers look great, so I would test it again before shocking. Of course, it never HURTS to shock, but no need to expend the bleach if you don't need to.

Up to you.........

Janet

[drako4]

I have not used anything other dichlor to bring up CYA.. I was going to just uncover and see what happened for today, but, we now have a forecast of rainshowers all day.

Might be a silly question but here goes anyway.. If I uncover will the rain change any of my readings. I am not sure how rain really effects a pool. Should I leave covered?

Cheers
Carrie

[aylad]

The rain probably will dilute your chlorine, albeit only a little--unless it's a storm with lots of wind that would blow debris into your pool. It shouldn't affect any of the other readings. So whether to cover it or not is up to you--do you need the water replenishment, or do you need to keep debris from blowing into the pool? If it's just passing rain showers, I'd leave it uncovered, but that's just my opinion.

Janet

[AnnaK]

Very heavy rain may increase your pH some. The splashing and splattering acts to aerate the pool much like a fountain does. Covering it would prevent that, of course.

Have you ever calculated how much water you add by raising the level of your pool by 1"? It's a useful calculation to do because you'll know how many extra gallons have been added to your pool by that 1 inch, and you can use the pool calculator to figure the effect of adding chemicals to the new volume. It also tells you whether a rainfall of 1/2", 1", 4" will make a difference and what difference it may make in the dilutions.

[drako4]

Hello,

Well the day after returning home I decided to shock since my FC was 5.5 and CC=0.5.
I did leave the pool uncovered but cc did not go away. I added 1 quart of bleach that evening and took the FC up to about 15. I left it uncovered.
My CC did go to 0 the following morning.
Upon testing this evening though, my FC is 5.5 and CC is back up to 0.5. There has been no swimming. Just wondering why the CC is up again. I know I was told that it was not necessary to shock with a CC of 0.5 or less. I was worried it might get away on me so decided to shock the pool. However, to do it again would probably have the same outcome??
Any ideas on what I should do or just leave it at this point. My PH is currently 7.4.
Prior to leaving My CC was consistently 0.

As always. Thanks!

[Watermom]

Don't worry about it. A CC reading less than 1ppm is insignificant.