Cannot maintain FC levels w/ BBB

[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]

Good morning.

My wife checked the FC level at 6pm last night and it was 7.8. She said the tested water only turned a very light shade of pink when adding the 5 drops of R-0003. That indicated to her that the CC level was near 0. She added (3) 121 oz jugs of 8.25% bleach. When I got home at 11pm I tested and the FC was 20, and similar to my wifes testing of the CC, the water only turned the absolute slightest shade of pink, so I added 1 drop of the R-0871 and it became colorless. This indicates to me that the CC is near 0. This morning at 7:30 I tested again. The FC was at 18 and the CC was similar to the night before.

So it looks like I lost ~ 2 ppm of FC (assuming a slightly incorrect reading as I tested a couple hours after sunrise).

I did not have a chance to scrub the floor and walls as Watermom suggested and there are small areas of brownish, greenish, yellowish patches sporadically on the pool floor.

What do you guys think?

[Watermom]

Keep the chlorine high again today and brush. I would go ahead and repeat the test tonight.

[Slachey]

Thanks for the quick reply Watermom.

Since the FC is currently at 18, do you recommend that I immediately bring it back up to 20, and ensure it is at 20 pretty much throughout the day and when I test tonight? Or am I ok keeping it in the 18 to 20 "range" throughout the day?

Note that on the pool math calculator, it states with a CYA of 100 that my normal FC range should be 8 to 13 and 39 for shock. With this said, should I go with a higher FC level to ensure I eliminate anything that the FC could be fighting?

[Watermom]

Is the CYA reading 100? Your previous post said 90. 18-25 would be ok but I wouldn't go to 39 especially since you have a vinyl pool. (Not sure where you got the 39 from?)

[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.

[Slachey]

So I added (2) gallons of 8.25% bleach at 6pm on 6/28 when the FC was at 13.8. I got home at 10pm and the FC was 18. I checked at 6am the next morning and it was at 17. I did not add anything all day yesterday and checked the FC at sundown last night (~ 8:15pm) and the FC was at 12. It lost 5 ppm of FC all day. I checked again this morning at 6am and it was at 10, so it lost 2 ppm overnight. I added (2) gallons this morning hoping to get it up to close to 20 again for the day.

The CC is reading 0, so I am a bit confused as to what I am to do next. The pool is taking at least (1) gallon per day to "maintain" FC level.

Any additional help would be appreciated.