Going back in the water after supershock?

[darikp]

I have to supershock my pool 25-100ppm depending on how long the family must wait to go back in and need advice.

FC- 14.5
cya >100
ph- 7.5
alk 130

vinyl ag; 10,500gal; 25 x 15 oval. avg temp 79-84


My specific question is; how long must we wait to go back in the water after a 25ppm shock as opposed to a 100ppm supershock?

[Watermom]

Why would you shock it to 100ppm? That is WAY too high for a vinyl pool. What test kit are you using to get the numbers you posted above? How does your water look? What are you using as your source of chlorine? And what do you use when you need to shock?

Welcome to the Pool Forum, by the way!

[kelemvor]

The best guess chart indicates 100ppm FC for Shock+ with a CYA of 100-200.

[darikp]

Thanks water mom, nice to finally be more than leacher. lol
Taylor 2006
water looks relatively clear but not blue; kinda has a tint to it still from the algae.
the 100ppm i'm getting from bens best guess chart.
I am now using 8.25% bleach as chlorine and shock
Previously I was another victim of unknowingly using Trichlor pucks exclusively. Until i found this forum, i couldn't understand why my levels were good and I was still getting algae.
My concern about shocking is because my sons bday party is sunday and I don't want to chem my pool unusable.

[Watermom]

Dilute your sample and run the CYA test again. Use equal parts pool water and CYA testing reagent, run the test again and multiply your report by 2. Post the result.

I would NOT shock the pool to 100!!

Also, what is your CC?

[darikp]

ok, I shocked it to 25... I didn't do any permanent damage did I.

(Thank you kelemvor)

I did cc but kept adding drops, I think i got to 80 something and gave up; I re-run everything tomorrow

[Watermom]

Might be a good idea to watch these testing demo videos and then try your CC test again.

http://pool9.net/K2006-vid/

You didn't hurt anything by shocking to 25ppm.

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[Watermom]

Not sure how your thread got closed but I am reopening. Sorry 'bout that!

[darikp]

thank you watermom;
Here's my update:
Shocked the pool to 25; 12 hours later my beautiful water is back.
I have no plans/desire to drain and replace water to correct high CYA problem, so my questions are these:
1)Using bens best guess chart, if my cya levels remain above 100, Is it correct that as long as I keep my FC between 8-15 I should experience no difference in my water than i would if the numbers were "normal"? By normal I mean; cya 30-50 with a fc between 3-6.
2) Is there any legitimate health concerns with maintaining these higher levels of chlorine, or is it really no different because of the actual effectiveness/release points of the chemicals?

[Watermom]

#1) Yes. You will be fine as long as your chlorine stays in range per the chart.
#2) It is no problem.

Did you run the CYA test with dilution? Did you try the CC test again?

[darikp]

Cya= 130
fc= 8
cc = 1.5
ph = 7.4
alk = 110

[Watermom]

How does the water look? Having a CC reading of 1.5ppm is high. Just to verify that you are running the CC test correctly, can you list the steps you did to get that reading?

[darikp]

I test FC first; fill to 10ml line;
add 2 dippers of r-0870
add r-0871 dropwise; (took 16 drops to turn clear) multiplied by .5 which gave me 8 for fc

then added 5 drops of r-0003;
added r-0871 dropwise; (took 3 drops, possibly 2 since it is hard to tell if its completely clear) multiplied by .5 which gave me 1.5 for cc

[Watermom]

You are doing the test correctly. Though your water may appear clear, if you have a CC reading of 1.5ppm, (anything over 0.5), then you need to shock the pool. With a CYA of 130, your shock level is going to be 25ppm. You want to keep your chlorine at shock level until three criteria are met:

1) You lose no more than 1ppm of FC from sundown one evening to within one hour of sunrise the next morning
2) You have no greater than 0.5ppm of CC
3) You have no signs of algae

At that point, keep the chlorine high for one additional day and then let it drift back down and keep it between 8-15 ALL the time.

Hope this helps!

(By the way, if one scoop of the powder turns the sample pink, you don't have to add the second one. That will save on your testing reagents.)

[darikp]

very helpful watermom, can't thank you enough!

p.s. thanks for the tip.

[Watermom]

You are welcome!