I am a new pool owner, with a 25,500 gallon in-ground gunite with pebble/plaster finish, using the BBB method with TF100 test kit since the new pool was handed over to me about a month ago. I ditched the pucks as soon as I passed the pool builders pool school and he was pulling out of the driveway.
I have some questions - I'm not in any trouble yet, but I'm looking to head off any problems beforehand. My water is blue, crystal clear, and danged near perfect, IMHO - but after reading topics here, and doing my testing diligently, I got the feeling I was losing too much chlorine during the day and decided to perform an OCLT overnight last night. The pool is in north central Texas, and gets 100% sun all day. Typically I'll test in the evenings when I get home from work, and usually have 0 to 0.5 FC, and usually 0 CC, but occasionally 0.25. Normally not a heavy bather load - just my 2 kids, and sometimes one of their friends during parts of the day.
I was gone all weekend, returning home Sunday evening. FC was 0, and pH was at 7.8 (last treated on Thursday evening), so I added my 212oz of bleach, and 69oz of acid Sunday evening. Monday afternoon, I had 1.5 FC, 0.25 CC, and pH 7.5 = treated with 185oz bleach, and 42oz of acid (I was shooting for an FC level of 5.0 to prep for my OCLT last night)
Here's where it gets interesting - after dark, and after about two hours of running the pump/filter - my FC was at 7.0ppm and pH was at 7.2.
7.0 > 5.0, by a long shot. Either I don't have 25,500 gallons, or I measured wrong?
And for the big payoff: this morning, I got up early to test, and when I went and grabbed my first water sample, I realized the pump/filter wasn't running. So I turn it on, and go make a pot of coffee, coming back 10 minutes later and take my water sample. FC = 5.0, pH 7.2... So now comes the question - 2.0ppm FC drop overnight means I have to shock??? Or, should I have let the water circulate for more than 10 minutes in order to "even out" my water sample?
The full test results for the chem-geeks among us (you know who you are! :-D ):
-------7/8------7/9(5pm)---7/9 (9pm)---7/10 (6am)
FC------0--------1.5---------7.0*----------5.0**
CC------0--------0.25---------0--------------0
TA----110--------110
CH----230--------240
CYA----40---------40
pH-----7.8--------7.5--------7.2-----------7.2
* What the....???
** <expletive deleted>
Thoughts and suggestions requested please? And thanks in advance!
I have some questions - I'm not in any trouble yet, but I'm looking to head off any problems beforehand. My water is blue, crystal clear, and danged near perfect, IMHO - but after reading topics here, and doing my testing diligently, I got the feeling I was losing too much chlorine during the day and decided to perform an OCLT overnight last night. The pool is in north central Texas, and gets 100% sun all day. Typically I'll test in the evenings when I get home from work, and usually have 0 to 0.5 FC, and usually 0 CC, but occasionally 0.25. Normally not a heavy bather load - just my 2 kids, and sometimes one of their friends during parts of the day.
I was gone all weekend, returning home Sunday evening. FC was 0, and pH was at 7.8 (last treated on Thursday evening), so I added my 212oz of bleach, and 69oz of acid Sunday evening. Monday afternoon, I had 1.5 FC, 0.25 CC, and pH 7.5 = treated with 185oz bleach, and 42oz of acid (I was shooting for an FC level of 5.0 to prep for my OCLT last night)
Here's where it gets interesting - after dark, and after about two hours of running the pump/filter - my FC was at 7.0ppm and pH was at 7.2.
7.0 > 5.0, by a long shot. Either I don't have 25,500 gallons, or I measured wrong?
And for the big payoff: this morning, I got up early to test, and when I went and grabbed my first water sample, I realized the pump/filter wasn't running. So I turn it on, and go make a pot of coffee, coming back 10 minutes later and take my water sample. FC = 5.0, pH 7.2... So now comes the question - 2.0ppm FC drop overnight means I have to shock??? Or, should I have let the water circulate for more than 10 minutes in order to "even out" my water sample?
The full test results for the chem-geeks among us (you know who you are! :-D ):
-------7/8------7/9(5pm)---7/9 (9pm)---7/10 (6am)
FC------0--------1.5---------7.0*----------5.0**
CC------0--------0.25---------0--------------0
TA----110--------110
CH----230--------240
CYA----40---------40
pH-----7.8--------7.5--------7.2-----------7.2
* What the....???
** <expletive deleted>
Thoughts and suggestions requested please? And thanks in advance!