Oh! There you are. I was over on the Chem board and I heard a beration alert, so I came running over here.
Soooo.
FC 13, calm down, that's fine and dandy.
Remember we NEVER read FC without knowing CYA cause FC 5/CYA 10 is scarier than FC 13/ CYA 70.
Lets start with the pool measurments. Best done in segments and added together. (Whatever you do never say "Sure" when your pool asks "Does my butt looks big in this yard?)
The Deep bit plus the sloping bit plus the shallow bit plus the sunshelf bit and the spa bit.
That will approximate the size.
Pool math will zero in on the size related to your chemicals.
One question, when you tested the 2nd time, did you:
1. Test water from same sample?
2. Go get another sample from the same spot?
3. Go get a new sample from a different location?
Next, the actual strength of the chlorine. It says 8.25%. Usually that would mean it is a little less based on age, but it could be stronger.
It gets back to what I said before; Pool math will zero in on the size related to your chemicals.
In the end all we want is predictable results from known quantities.
Are you getting predictable results with other chemicals; the obvious one would be MA on pH.
I think you mentioned you were adding 1/2 jugs for a while. Did the before & after on pH match up with expectations for 64oz MA ?
Don't worry if you can't remember.
So, lets take a new sample and retest.
Work out what size pool reacts to 43oz of 8.25% Chlorine with the swing you see.
That can be the pool math size for now.
See if next time you dose based on this new size, it comes out as expected.
If not, fine tune the size some more.
Do you feel berated?
You don't look berated.
And your butt does not look big in that.
You may be the funniest person I know!
One question, when you tested the 2nd time, did you:
1. Test water from same sample?
No - I pulled new water
2. Go get another sample from the same spot?
Yes, I have a habit of going to the same spot
3. Go get a new sample from a different location?
New sample - but from same spot
My pool has been so easy. The first week we got the PT - I would send my testing to my PB and he would say "pour 1/2 bottle into the return - SLOWLY" I never measured - he said it didn't have to be exact. I never did any pool math at that point - I only tested and sent my PB the results. I do have all my records going back to day 1. I have a little calendar book that I write everything into when I test and when I add. Not sure if there is a way to backtrack and see if the numbers can be entered backwards . . . Though my PB said the PT will make the numbers jump all over the place while it is curing for the first few weeks.
For example:
7/6 PH 8.2 added 1/2 btl Acid
7/7 PH 7.8 added 1/2 btl Acid
7/8 PH 7.5 no addition
7/9 PH 7.8 added 1/2 btl Acid
7/10 PH 7.5 no addition
7/11 PH 7.8 added 1/2 btl Acid
7/12 PH 7.5 no addition
It goes back and forth like this until the 23rd Since then - my PH has stayed 7.2 -7.4. We were running the waterfalls pro 6 hours a day (we were in the pool a LOT) and I still run them about 5 hours at night - to cool it off - and anywhere from 0-8 hours a day depending on if we are in the pool or not.
Other than Acid and pucks the ONLY thing I have ever added was last weekend Soda Ash to up my PH -- I did this last Saturday. My PH was about 7.1 I added 17 oz of soda ash. In 1 hour my PH was 7.4 and is still testing at 7.4 today.
I have to finish up work (I have REALLY spent more time on the dang pool today than my job) but I will retest in a few hours and also figure out the backwards math on the 43 oz of chlorine.
Thank you Oz. Seriously. Thank you.
- - - Updated - - -
First off, NO NEED TO WORRY! FC of 13 is not that high, especially if your CYA is 70. At CYA of 70, shock level would be 28. 13 is just a little high - but no big deal. If your CYA is 40, shock level is still 16 which you are below. You can safely swim below shock level.
My guess is your estimated pool size is too high. Also, were you circulating water through the spa during that time? If not, you have to exclude that volume. As a note, since you weren't measuring MA additions, you didn't gain any insight at that time regarding a possible miscalculation of your pool size. No big deal just a missed opportunity. You can zero in on volume with various chemical additions over time by comparing the intended result with the actual result, just like you did today with chlorine.
Oz beat me to most of it but the same gist.
I guess I was just so shocked - I really expected it to come out perfect. The Spa circulates with the pool it has a constant spillover.
Thanks again guys. :super:
The only thing that I can think of would be that I have the size of the pool wrong. We have it at 14,500 Gal. We got that by looking at the water gauge at the start and end of the fill. We took off 500 gallons thinking that would be for showers and such. But maybe we are way off.
