water chemistry before closing

nadar

Active member
Oct 21, 2018
33
Northern Tennessee
A pool service is closing my pool tomorrow morning. I went to a pool store yesterday to pick up some polyquat and I let them test my water while I was there. According to both of our tests, FC is 10, CC is .5, PH is 7.8, CYA is 50, and calcium is 250. Pool store says that phosphates are 200 so I need to add some non-chlorine shock to my pool before I add the polyquat to oxidize the organics in my pool. (They said that I didn’t have time to use phophate remover since I’m closing tomorrow.) I assume the phosphates are high because it is impossible to keep leaves out of the pool and it rained a day after shocking it. Would it help if I added some non-chlorine shock to the pool like the pool store recommended before adding the polyquat? I also need to know if I need to decrease PH since it is 7.8 or if it is just high because I shocked a few days ago and FC is 10. If I need to lower it before adding polyquat, how long do I need to wait after adding the muriatic acid before I can add the polyquat?
 

duraleigh

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Apr 1, 2007
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Disregard the advice on phosphates......it's bogus advice

What is your TA??

What does your water look like?
 

nadar

Active member
Oct 21, 2018
33
Northern Tennessee
Disregard the advice on phosphates......it's bogus advice

What is your TA??

What does your water look like?
Water is clear but has some crumpled up leaf debris in it. I plan on vacuuming before adding the polyquat. Looks like TA is around 70 or 80 but the chemicals have expired so I can't be sure this is accurate. PH is currently around 7.8 and I'm pretty sure this is accurate since I got a brand new bottle of R004 a few months ago. Should I lower the PH to 7.4 or 7.5 before closing or is it just high because I shocked a few days ago and FC is still around 10?
 
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wireform

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In The Industry
Aug 15, 2017
1,268
Spring Valley, NY
Water is clear but has some crumpled up leaf debris in it. I plan on vacuuming before adding the polyquat. Looks like TA is around 70 or 80 but the chemicals have expired so I can't be sure this is accurate. PH is currently around 7.8 and I'm pretty sure this is accurate since I got a brand new bottle of R004 a few months ago. Should I lower the PH to 7.4 or 7.5 before closing or is it just high because I shocked a few days ago and FC is still around 10?
You say your regents are expired but the PH is newer. If you're sure the FC isn't more then 10 I will say drop your PH.
 
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duraleigh

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Yeah, I would say to vacuum it clean and lower your pH to around 7.4. The pH will tend to rise a little over the winter anyway.
 

Saturn94

Well-known member
Mar 11, 2015
877
SE Virginia
BTW, if you did use phosphate remover (not needed IMO), you can add it right before closing, just make sure it’s well mixed in the pool before you shut down the pump and cover the pool. The phosphates will settle to the bottom over the winter ready to be vacuumed out at spring opening.

I use to do this every closing until I learned it wasn’t necessary.
 

Saturn94

Well-known member
Mar 11, 2015
877
SE Virginia
Regarding pH, it depends on how pH changes in your pool over the winter. The pH in our pool always drops a bit over the winter so I raise it at closing.