# Thread: My Question/problem of the day...

1. ## My Question/problem of the day...

I have a ton of questions, but hate starting a new thread for each of them, so I'm going to have one thread that I will ask most of them here.

FINALLY got my test kit, and here are this afternoon's numbers-

FC - .32
CC - .08
PH - 7.4
TA - 90
CYA 80

So according to the calculator I need to add a small amount of washing soda and chlorine. Water has really cleared up the last several days, but we still have a green shade...is shocking a given when opening a pool after having it dormant for the winter? If so, does it appear okay to start shocking?

As always, thanks for the replies and help.

2. ## Re: My Question/problem of the day...

What test kit? The ones we recommend do not go to 2 decimal places.

Leave the pH and TA alone, they are fine. Although you CYA is a bit high so a 30-40% water change would not hurt.

Actually if you are going to start the shock process, you may want to lower the pH a bit before you start.

3. ## Re: My Question/problem of the day...

Originally Posted by RowdyC
I have a ton of questions, but hate starting a new thread for each of them, so I'm going to have one thread that I will ask most of them here.

FINALLY got my test kit, and here are this afternoon's numbers-

FC - .32
CC - .08
PH - 7.4
TA - 90
CYA 80

So according to the calculator I need to add a small amount of washing soda and chlorine. Water has really cleared up the last several days, but we still have a green shade...is shocking a given when opening a pool after having it dormant for the winter? If so, does it appear okay to start shocking?

As always, thanks for the replies and help.
Typo, maybe? You sure you don't mean FC 3.2? Too low for 80 CYA. Never let it dip below 9. Ever.

Your pH is just fine where it is.

4. ## Re: My Question/problem of the day...

If you're using the K2006 or TF-100 those should be 3.2 and .8. Either way, the chlorine is too low, and the CYA is on the high side, especially for shocking. I don't see a CH number. Did you test for that? I would leave pH and TA alone. The TA is on the high side of recommended, and pH will rise on its own. Also, when doing the chlorine test you can use the 10 ml sample (provided you are using the TF-100 or K-2006.)

5. ## Re: My Question/problem of the day...

I'm using my NEW K-2006 (I'm excited). I was watching a YouTube video from "swimjim"? And I was doing math based upon their stats. eg. FC 16 drops x .02, and that is where I got .32

I did not do the CH test but will try and get to that one before dark. The CYA test seemed fickle, so I think I'll try the 1/2 & 1/2 test next time.

So when is the best time to test water? And should I test again before making adding anything? Also, are their better videos to watch the use of the K-2006?

6. ## Re: My Question/problem of the day...

If you started with 25 ml of water then you multiply by 0.2, but you should just use 10 ml of water and multiply by 0.5.

Test anytime as long as the pump has been on for an hour. Then add what you need based on that test.

There are videos for all the TF-100 tests which are basically the same thing:

7. ## Re: My Question/problem of the day...

What Jason said, testing to .2 with a 25 ml sample is just wasting reagent .5 resolution is plenty to FC or CC, chances are you can't repeat to .2 from 2 different samples.

8. ## Re: My Question/problem of the day...

Today's numbers:
FC - 9
CC - 0.5
TA - 90
PH - 7.6
CYA - 75-80 - I hate this test regardless of how many times I re-use test agent.
CH - 280

Several questions today -
#1. What's the school of thought about shocking before/during/after rain storms?

#2. Hooked up the vacuum and pump lost prime momentarily and then returns started blowing "dirt/filth" back in pool? WTH? I did shut off pump, back washed (very dirty), rinsed, primed and started again, all seemed fine.

9. ## Re: My Question/problem of the day...

To answer your questions on shocking... no it is not a given that you need to shock upon opening for the season, nor do you need to shock just because it has rained. I'm on my second season of a pool and have never gone through the shocking process.

10. ## Re: My Question/problem of the day...

Started the "shock process", used pool calculator and added what it suggested based on my readings.
Brushed, waited an hour and fifteen minutes and my target FC was 30 but actually read 39.

Pre shock- FC 5, CC 1, TA 90, PH 7.4, CYA 80, CH 280

Is one of my readings off? Or was my math off adding 710oz of bleach?

Just a little nervous with such a high FC number.

11. ## Re: My Question/problem of the day...

When I plug your info into the pool calculator, I get that you should have added 933oz. of 6% bleach to get from 5 to 30 ppm FC for an 18k gallon pool.

Seeing that you overshot your target, it could be that the bleach you are using has a higher concentration than what is listed on the bottle, or your pool isn't actually 18,000 gallons, or the bleach didn't fully mix before you remeasured.

Either way, no need to worry about 39ppm with a CYA of 80.

12. ## Re: My Question/problem of the day...

It's been a long time since I barely passed college chemistry...but it appears that the bleach is 8%.

Thanks for the re-assurance that I'm not melting PVC pieces etc. I'll guess that it's not mixed as well as it should be, and test again in an hour!

THANKS!

13. ## Re: My Question/problem of the day...

1.5 hours later and FC is 36. Should I just let it drop to the 30-31 range and then concentrate on holding it there?

14. ## Re: My Question/problem of the day...

Yes, that's a good plan.

15. ## Re: My Question/problem of the day...

9+ hours and the FC is still holding at 36, got lucky with a very cloudy day. We've brushed 2 times and I'm going to go brush again in the dark (sounds like a country song...a bad one, but), if FC holds throughout the night, and water is clear,can I consider this shock therapy done?

16. ## Re: My Question/problem of the day...

If CC<.5, OCLT<1ppm, and the water is clear, you are done shocking.

17. ## Re: My Question/problem of the day...

Q of the day: I have things floating on the water surface, that appear to be tree pollen. It's been doing this for several weeks. When I run the filter for 12+ hours it pretty much eliminates it, but comes back the next day. If this is indeed tree pollen (cottonwood), than it is what it is, but if its a sign of some sort of algae, I'd like to jump on it ASAP. I do live in a neighborhood with lots of big trees, with several cottonwoods and Bradford pears.
My chemicals are all in the normal range (according to pool calculator) and have been with the exception of a 3 day period when we were out of town. CC went up to 1.5 and FC dropped to below 2...haven't shocked since that drop.

18. ## Re: My Question/problem of the day...

Can you post a set of test results?

I've found it doesn't hurt to bring your FC up to shock level if you think there's any chance its algae.

FC - 9
CC - 0.5
TA - 90
PH - 7.5
CYA - 75
CH - 280

20. ## Re: My Question/problem of the day...

If it is collecting at the waterline and in the depressions in the floor but not on the walls it is probably pollen. Pollen does not feel slimy and comes back daily even with high levels of chlorine.

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