Cannot maintain FC levels w/ BBB

[Watermom]

You may be fighting something in the water which is consuming your chlorine.

In your pool, each of those 121-oz jugs will add about 4.5ppm of chlorine. So, if you had 4.6 in there and added 9ppm more, that would put you at 13.6. But, then you report that by 6:40 a.m. the next morning, you were down to 10.6. That is a loss of 3ppm overnight. When you lose more than 1ppm of chlorine overnight, it is a sign that you are fighting something.

What I am going to suggest is that you go ahead and shock the pool up to 20ppm this evening. Then, a couple of hours after you add the bleach, test the FC and the CC (I assume you have a Taylor K2006 kit?) again and make note of the readings. Tomorrow morning, within one hour of sunrise, test FC and CC again and see how much chlorine you lost overnight.

You need to continue to keep your chlorine at shock level until you can go from sundown to sunup without losing more than 1ppm of chlorine AND you have no greater than 0.5ppm of CC.

Let us know in the morning the results of your overnight test.

[Watermom]

Dave and I were apparently posting at the same time, but you see that the advice is the same.

[Watermom]

Also, brush the pool while the chlorine is high and run the pump 24/7 while you are working on this.

[Slachey]

Thank you Watermom.

We are going to a baseball game tonight, but I will have my wife shock the pool and we will test late tonight.

Thank you all!

[Slachey]

BTW, can my daughter swim if the pool is at 20 FC?

[BigDave]

With a CYA of 90, sure. Wear an old suit.

[Watermom]

Yes, but she will probably want to wear on old swimsuit that she won't care if it fades some.

[Slachey]

Great. Thanks again. I love this site!

[Slachey]

Thanks PoolDoc.

Watermom,

No offense taken at all. As mentioned, this site and the replies to my issue have been a great experience so far. I am leaving again for the evening so I added 2 gallons of 8.25% bleach. My FC was down to 13.8 this evening (No CC) from the 18 I measured this morning.

I'll test when I get home tonight and again in the AM.

I hope this stabilizes soon!

Thanks again.