Friends,
I'm conducting a water exchange on my pool.
CH = 850 (! I was a bit shocked by this number, but we haven't replaced/exchanged water for 2 1/5 years, so I figure it is just a product of that)
Salt = 2000
Additionally:
TA = 110
CYA = 50
PH = 7.6
FC = 1
CC = 0
PWT = 67
FWT = 50
FW Salt = 0
FW CH = 75 (note: this test came up blue-ish purple at 50, full blue at 75, so I am using the higher number in my calculations)
A few questions regarding the exchange math (at the bottom):
Referring to the Draining - Further Reading page,
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"Replacing water in-place process depends on several factors:[3]
If DeltaT is positive, then you want to fill at the lowest point and extract at the surface and at the greatest distance from the lowest point.
If DeltaT is negative, then you want to extract at the lowest point and fill at the surface and at the greatest distance from the lowest point. <-Preferred as it is easier to do with a drain pump and you can fill inside one of the skimmers.
If |DeltaT| < 5, then there will be a lot of mixing."
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1) Is FWTDS simply adding FW Salt + FW CH? So in my case, FWTDS = 75?
2) I'm wondering if the order of operations is correct in this calculation because when I calculate this out as written,
(67 - 75 * .006) - (50 - 75 * .006) = 17
OR is it supposed to be:
((67 - 75) * .006) - ((50 - 75) * .006) = .102
Either way it's positive, so my exchange method is fresh in the deep end, extract from the surface.
3) Can you explain what that number 17 or .102 represents as the delta?
Thanks!
I'm conducting a water exchange on my pool.
CH = 850 (! I was a bit shocked by this number, but we haven't replaced/exchanged water for 2 1/5 years, so I figure it is just a product of that)
Salt = 2000
Additionally:
TA = 110
CYA = 50
PH = 7.6
FC = 1
CC = 0
PWT = 67
FWT = 50
FW Salt = 0
FW CH = 75 (note: this test came up blue-ish purple at 50, full blue at 75, so I am using the higher number in my calculations)
A few questions regarding the exchange math (at the bottom):
Referring to the Draining - Further Reading page,
-----------------------------------------------------------------------------------
"Replacing water in-place process depends on several factors:[3]
- Pool Water TDS (PWTDS)
- Pool Water Temperature (PWT)
- Fill Water TDS (FWTDS)
- Fill Water Temperature (FWT)
If DeltaT is positive, then you want to fill at the lowest point and extract at the surface and at the greatest distance from the lowest point.
If DeltaT is negative, then you want to extract at the lowest point and fill at the surface and at the greatest distance from the lowest point. <-Preferred as it is easier to do with a drain pump and you can fill inside one of the skimmers.
If |DeltaT| < 5, then there will be a lot of mixing."
----------------------------------------------------------------------------------------
1) Is FWTDS simply adding FW Salt + FW CH? So in my case, FWTDS = 75?
2) I'm wondering if the order of operations is correct in this calculation because when I calculate this out as written,
(67 - 75 * .006) - (50 - 75 * .006) = 17
OR is it supposed to be:
((67 - 75) * .006) - ((50 - 75) * .006) = .102
Either way it's positive, so my exchange method is fresh in the deep end, extract from the surface.
3) Can you explain what that number 17 or .102 represents as the delta?
Thanks!
