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Thread: Closing help please

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    E Murph's Avatar
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    Closing help please

    Ok. I love this method. It's worked great all summer. Now I closed my pool last week and I'm concerned. It rained like crazy the days prior to my close. I tested everything the day before close and my pH was higher than ever. I've been having to lower it a little here and there all summer but I had a good handle on it. Here are my numbers the day before close. (Last Wednesday)
    Fc 20. I got a little carried away
    Ph 8.0
    Ta 70
    Ch 275
    Ca 40

    No salt paster pool

    I added a quart of algaecide (pro 60) left over from my old pool store chemical says. And 18 oz of acid to knock down the ph and the pool was closed

    I pulled the cover back today just to check and to my surprise the ph is now as low as it can read on my test. 6.8? Maybe lower?
    Ta looks a little low too but not bad at 60. My fc is now at 13
    Ch unchanged

    I'm assuming (Its covered with solid cover with pump on top no rain getting in) that the fc should hold all winter and not much should change over the winter? Did the algaecide change my ph? I dropped a pump in the deep end and ran a hose around to the shallow end and put some borax in hoping to bring the ph up.
    Should I add bleach? Am I on the right track? What happened?

    Thanks!!!
    15,000gal, IG plaster, DE filter, Centurian 2HP pump, Raypak propane heater, built in 2005, Taylor K-2006 test kit.

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    domct203's Avatar
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    Re: Closing help please

    18oz of 31.45% MA would only lower your pool's pH by about 0.3

    pH will read falsely high with FC greater than 10ppm.

    You're correct that with the cold water temps & being covered that the chlorine will last a long time.

    Have you checked your pH again?
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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    E Murph's Avatar
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    Re: Closing help please

    The high chlorine is the answer! Thank you. I was trying to get the FC to slam level for closing but I over shot it and ended up at 20! That must have given me a false ph reading. and I made it worse by adding acid at closing and now am getting accurate readings. Now I know! I added borax and checked again and I'm at 7.0, maybe 7.1. so its moving. I'll ad more. I'm concerned I'm not getting it mixed up thouroghly with just a portable pump and the garden hose? Is there any better way to mix the water since I obviously can't use the pool pump? I want to make sure my CSI stays inline but with temperature being a part of that calculation how do I manage that as winter comes and water gets colder and colder? Thanks!!!

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    Re: Closing help please

    Quote Originally Posted by E Murph View Post
    The high chlorine is the answer! Thank you. I was trying to get the FC to slam level for closing but I over shot it and ended up at 20! That must have given me a false ph reading. and I made it worse by adding acid at closing and now am getting accurate readings. Now I know! I added borax and checked again and I'm at 7.0, maybe 7.1. so its moving. I'll ad more. I'm concerned I'm not getting it mixed up thouroghly with just a portable pump and the garden hose? Is there any better way to mix the water since I obviously can't use the pool pump? I want to make sure my CSI stays inline but with temperature being a part of that calculation how do I manage that as winter comes and water gets colder and colder? Thanks!!!
    If your FC is still <10ppm and you have poor water circulation your pH readings are not accurate. You should stop adding borax/MA.

    80oz of Borax will raise pH 0.3 and offset the 18oz of 31.45% MA that you previously added.

    How much Borax did you add?
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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    E Murph's Avatar
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    Re: Closing help please

    Quote Originally Posted by domct203 View Post
    If your FC is still <10ppm and you have poor water circulation your pH readings are not accurate. You should stop adding borax/MA.

    80oz of Borax will raise pH 0.3 and offset the 18oz of 31.45% MA that you previously added.

    How much Borax did you add?
    I put in a whole box. About 80oz?
    So I can't rely on a water test now that the pump is not running?
    15,000gal, IG plaster, DE filter, Centurian 2HP pump, Raypak propane heater, built in 2005, Taylor K-2006 test kit.

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    Re: Closing help please

    Quote Originally Posted by E Murph View Post
    I put in a whole box. About 80oz?
    So I can't rely on a water test now that the pump is not running?
    Unless you can brush or otherwise circulate the water I wouldn't bother testing. If your pH was good before you raised FC to shock level, you should be fine now. The Borax you added will offset the MA and have you back to where you started.

    Are you certain you mixed the Borax in well as to not have clumps of it sitting on the bottom?
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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    E Murph's Avatar
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    Re: Closing help please

    I ran a utility pump with the hose returning the water at the opposite end of the pool. Shouldn't be anything laying on the bottom. I just want to be sure it's ok when I open. I didn't realize I couldn't test with fc over 10. I was planning on checiking it ocassionaly over the winter. A few years ago when I was still trusting those pool store people I had what they called winter scale. It wa a horrible thing. Little razor sharp pieces of stuff all over the plaster it was horrible to get rid of. After I learned this system I realized I probably had the csi way out of whack that winter.

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