- May 11, 2021
- 973
- Pool Size
- 7000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-30
I got a LOT of rain over the the extended weekend, around 4" of rain. So, I got quite some dilution on my water and few things did not go the way I expected.
On Thursday evening my numbers were:
FC: 3.5
CC: 0.5ish (very light pink)
pH: 7.6
TA: 85
CH: 150 **
CYA: 27 **
BOR: 40ish
In preparation for the long rainy and cold (for this time of year) weekend that I wasn't going to attend to the pool I added 10oz of 68% Cal-Hypo to bring my FC up about 7ppm and my CH up about 5ppm, that would leave my FC around 10.5ppm, so slightly under SLAM level. I put my solar cover on, trusted the math and did not retest until Monday evening. **
On Monday evening my numbers were:
FC: 8.5
CC: 0
pH: 7.2
TA: 80
CH: 150
CYA: <20 (the black dot disappears only when I top off the view tube)
BOR: 40ish
So, here are my observations and assumptions. Not really questions, but I'd appreciate any comments that would help to make sense of it.
- Unless one collects and tests rain water (what I did not do) it is impossible to know what is is it
- Colder water temp plus solar cover did an amazing job retaining FC
- Solar cover likely prevented aeration from rain
- pH and TA dropped more than I'd have imagined, as if I had added acid (the 0.1 difference is likely due to my inability to differentiate among tones of red)
- The CH drop is within what I'd expect from the level of dilution, assuming the rain water had some, but not much CH in it.
- My CYA dropped way more than I'd have imagined or that I could find a reasonable explanation
- My borates seems untouched by dilution... I guess I just can't differentiate tones of orange either
** Notes:
- Yes, my CYA was low because I expected to use tablets for few days and wanted to keep my CYA manageable. As that will no longer happen I already added stabilizer to bring it slightly about 30ppm
- Yes, I know a CYA of 30ppm is still low, but my FC loss has proven very manageable so far. I expect to have to raise it once school ends and I start removing the solar cover in the morning (more sun light directly on the pool)
- How I know the FC loss is manageable? Let's just say my wife is telling me I have Testing OCD (not really... just trying to understand how the pool behaves)
- I'm using Cal-Hypo because I need to increase my CH to the recommended levels of my heat-pump. Well, and because I have a lot of it. You know from before finding TFP
On Thursday evening my numbers were:
FC: 3.5
CC: 0.5ish (very light pink)
pH: 7.6
TA: 85
CH: 150 **
CYA: 27 **
BOR: 40ish
In preparation for the long rainy and cold (for this time of year) weekend that I wasn't going to attend to the pool I added 10oz of 68% Cal-Hypo to bring my FC up about 7ppm and my CH up about 5ppm, that would leave my FC around 10.5ppm, so slightly under SLAM level. I put my solar cover on, trusted the math and did not retest until Monday evening. **
On Monday evening my numbers were:
FC: 8.5
CC: 0
pH: 7.2
TA: 80
CH: 150
CYA: <20 (the black dot disappears only when I top off the view tube)
BOR: 40ish
So, here are my observations and assumptions. Not really questions, but I'd appreciate any comments that would help to make sense of it.
- Unless one collects and tests rain water (what I did not do) it is impossible to know what is is it
- Colder water temp plus solar cover did an amazing job retaining FC
- Solar cover likely prevented aeration from rain
- pH and TA dropped more than I'd have imagined, as if I had added acid (the 0.1 difference is likely due to my inability to differentiate among tones of red)
- The CH drop is within what I'd expect from the level of dilution, assuming the rain water had some, but not much CH in it.
- My CYA dropped way more than I'd have imagined or that I could find a reasonable explanation
- My borates seems untouched by dilution... I guess I just can't differentiate tones of orange either
** Notes:
- Yes, my CYA was low because I expected to use tablets for few days and wanted to keep my CYA manageable. As that will no longer happen I already added stabilizer to bring it slightly about 30ppm
- Yes, I know a CYA of 30ppm is still low, but my FC loss has proven very manageable so far. I expect to have to raise it once school ends and I start removing the solar cover in the morning (more sun light directly on the pool)
- How I know the FC loss is manageable? Let's just say my wife is telling me I have Testing OCD (not really... just trying to understand how the pool behaves)
- I'm using Cal-Hypo because I need to increase my CH to the recommended levels of my heat-pump. Well, and because I have a lot of it. You know from before finding TFP
Last edited:
