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Thread: testing in cold water?

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    Join Date
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    testing in cold water?

    Did not cover pool this year and water temp is now about 40. Still check chemistry from time to time. Thought I saw on this site a page describing which tests can be done in cold water and which require water to be brought to room temp. But cannot find now. Is there such a page?
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    JasonLion's Avatar
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    Re: testing in cold water?

    CYA should be done after the water warms up to room temperature. Chlorine and PH must be done before the water warms up. The remaining tests don't care if the water warms up or not.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: testing in cold water?

    Quote Originally Posted by JasonLion View Post
    CYA should be done after the water warms up to room temperature. Chlorine and PH must be done before the water warms up. The remaining tests don't care if the water warms up or not.
    cool, so to speak
    will do as you say though may let the ice melt
    thank you
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Re: testing in cold water?

    by the way, is fun watching chemistry in this cool water
    takes forever for FC to drop from 11 to 5
    have had to back wash out an inch or two of rain water 5 times so far and then found
    CH to be 220
    and CYA so low as to be basically unreadable
    TA seems to hang in there at 60 or 70
    pH creeps up but then it always does in this pool (pt of acid now and then is SOP)
    skin of ice two or three times but melts fast when pump goes on
    found a dead mouse, I think the flesh had not decayed at all; looked felt like a living mouse save rather stiff
    worst problem is black ice on the slate surround, treacherous
    any way is fun
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    JasonLion's Avatar
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    Re: testing in cold water?

    Unless you tend to have problems with metal staining, you should allow the PH to go 0.2 or 0.3 higher than normal as the water temperature approaches freezing. The PH will naturally rise by about about that much as the water cools.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: testing in cold water?

    Quote Originally Posted by JasonLion View Post
    Unless you tend to have problems with metal staining, you should allow the PH to go 0.2 or 0.3 higher than normal as the water temperature approaches freezing. The PH will naturally rise by about about that much as the water cools.
    ok
    will leave it alone till it hits 8
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Join Date
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    Re: testing in cold water?

    That's the approach I've been doing as well (learned it here). Only treating pH when it hits 8. And keeping FC between 7-9. My pool water temp is currently 45. Will have to take a full set of tests after all this rain ends and see where everything is. Seems to have been working well.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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