Puzzled about no FC

[LearningCurve]

some strips will bleach out with high chlorine....depends on the reagent that they use.l

I was attempting to rule this out by diluting the sample with tap water. I started 1/3 pool to 2/3 tap water, and the strip tested no FC. I actually did it again 1/4 to 3/4 and still got none.

[waterbear]

When you closed the pool was your CYA level higher than the 30 ppm you tested now? If so it is possible that some of your CYA biodegraded. This would cause a huge chlorine demand since the bacteria will excrete ammonia compounds and urea.

[LearningCurve]

When you closed the pool was your CYA level higher than the 30 ppm you tested now? If so it is possible that some of your CYA biodegraded. This would cause a huge chlorine demand since the bacteria will excrete ammonia compounds and urea.

I know that the CYA was arount 40 when the pool was closed last year. The bill from my dealer has 4# of "conditioner" So I assume that they put CYA in also. So my best guess is that there wasn't much left at open.

If this is the case, how much chlorine would a guy need to put in to overcome, and still not damage the liner?

THANKS!

[aylad]

Check the Best Guess chart sticky note at the top of the chlorine forum...

Janet

[LearningCurve]

Check the Best Guess chart sticky note at the top of the chlorine forum...

Janet

I don't think you understood my question.
I realize that the best guess sticky has 15ppm as a shock level.
I have already put enough chlorine in that should have taken it beyond 15ppm.

This would cause a huge chlorine demand since the bacteria will excrete ammonia compounds and urea.

How much should this take to overcome this ammonia compounds and urea ?
At this point I am assuming I have a WHOLE BUNCH of CC.
IS CC bad for the vinyl liner?

I appreciate the help!

[waterbear]

Just keep your total chlorine levels at 12-15 ppm and keep hitting it with chlorine morning, noon, and night until the FC starts to hold! It might take a LOT of bleach but it will eventually hold. If you let your chlorine levels yo-yo up and down it will take longer so just keep testing and adding bleach to keep the level at about 12-15 ppm and you should be fine.

For more info read the posts by PoolDoc (Ben) in this thresd
http://www.poolforum.com/pf2/showthread.php?t=401

[LearningCurve]

The pool store test today showed:
TC 4+
FC 1.1
PH 7.4
TA 150
Ca 170
CYA 70

I just dumped in another 9 gallons of bleach. After 30 minutes I still don't test any FC on a strip. The strips do register the max level of FC if I pour bleach directly on the strip.

I guess I must be more patient.