Water has slowly turned slightly cloudy but still clear

WaterPirate

Member
May 24, 2020
7
NJ
Pool Size
17000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
Hi all - thanks in advance for everyone who has made this site such a wealth of information.

I have a new construction pool (specs in signature) that was finished late last fall and immediately winterized. It was opened early for our area (New Jersey) on March 31st, and has been crystal clear up until the last few days. While I thought my CYA had gotten up to 70, I'm now realizing I may have been too generous with considering the dot no longer visible. Using the at-a-glance advice, I suspect I'm actually at a 50. I'm not sure how to link my pool math results here (as I've seen others do) but here's my numbers:

FC 4.5
CC 0.0
PH 7.8
TA 70
CH 125
CYA 50

While I thought I've been at an ok FC level for the last few weeks as we've started to heat and swim in the pool, I suspect 4.5 doesn't quite cut it. I was at a 4.5 FC level yesterday afternoon, so this morning I added 64oz of 12.5% liquid chlorine. The above test results were taken just a few minutes ago, so the bump I thought I'd get appears to have been consumed but I'm surprised I'm not seeing any CCs if I have an algae problem.

I can still see the bottom of the pool and it doesn't appear to be getting any worse, but it's not like it used to be where it was stunningly crystal clear. As far as action items, I believe I may want to add some more stabilizer to get my CYA up, and add some muriatic acid to drop pH a bit. But what should I be doing as far a liquid chlorine. Should I be doing an over night chlorine loss test? Should I be running the pump over night? Currently my pump is set to run @ 2200rpm from 8am-8pm.

Obviously this is my first season with the pool, and it was feeling too easy but I thought I just did enough homework ahead of time! Guess I still have some learning to do! Any advice on what I should be doing is much appreciated! To be honest, I'm not sure what my situation is, which makes it more difficult to search how others have approached a solution. I've attached a photo of the pool to the extent that's helpful. I feel like it doesn't fully capture how cloudy it is but I suppose to only limited reference point is how it's looked the last two months.


Thank you!

Pool Photo.jpg
 
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Hey WP and Belated Welcome !!!!

You're doing GREAT !!!!

When you suspect an algae issue, either from clarity, CCs or unexpected FC loss, Overnight Chlorine Loss Test. Don't think it over, don't come ask if you should, just do. Then. Come tell us why you did and we will high five you and help pass the time waiting for the results.

So get the FC up to 8 to 10 with liquid chlorine and run the test. I suspect raising the FC will also bring the sparkle back. Hopefully it's just dull and not an outbreak.

Then. Upon not needing to SLAM, or having completed SLAM, be more mindful of going anywhere near minimum. 'Minimum' sounds ok, but it's not ok at all. It's where problems start and why would you want to flirt with that ? With chlorine prices what they are, needing a few dozen gallons of it because you dipped the FC a little low is insane.

We'll help you dial the SWG in a little better once this hiccup us behind us. Keep us posted. :)
 
Hi all - thanks in advance for everyone who has made this site such a wealth of information.

I have a new construction pool (specs in signature) that was finished late last fall and immediately winterized. It was opened early for our area (New Jersey) on March 31st, and has been crystal clear up until the last few days. While I thought my CYA had gotten up to 70, I'm now realizing I may have been too generous with considering the dot no longer visible. Using the at-a-glance advice, I suspect I'm actually at a 50. I'm not sure how to link my pool math results here (as I've seen others do) but here's my numbers:

FC 4.5
CC 0.0
PH 7.8
TA 70
CH 125
CYA 50

While I thought I've been at an ok FC level for the last few weeks as we've started to heat and swim in the pool, I suspect 4.5 doesn't quite cut it. I was at a 4.5 FC level yesterday afternoon, so this morning I added 64oz of 12.5% liquid chlorine. The above test results were taken just a few minutes ago, so the bump I thought I'd get appears to have been consumed but I'm surprised I'm not seeing any CCs if I have an algae problem.

I can still see the bottom of the pool and it doesn't appear to be getting any worse, but it's not like it used to be where it was stunningly crystal clear. As far as action items, I believe I may want to add some more stabilizer to get my CYA up, and add some muriatic acid to drop pH a bit. But what should I be doing as far a liquid chlorine. Should I be doing an over night chlorine loss test? Should I be running the pump over night? Currently my pump is set to run @ 2200rpm from 8am-8pm.

Obviously this is my first season with the pool, and it was feeling too easy but I thought I just did enough homework ahead of time! Guess I still have some learning to do! Any advice on what I should be doing is much appreciated! To be honest, I'm not sure what my situation is, which makes it more difficult to search how others have approached a solution. I've attached a photo of the pool to the extent that's helpful. I feel like it doesn't fully capture how cloudy it is but I suppose to only limited reference point is how it's looked the last two months.


Thank you!
In addition to above, your pH is fine. Leave it be until it gets to 8.0 then bump it back down.
 
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You learned that if your pool "sniffs" minimums it will cloud..right around 4-4.5.

Run your normal FC at the top end of the recommended range, in the summer, for your FC...8, even 9, with CYA of 50. Link-->PoolMath

I'm in OH, kinda like NJ. I can lose 4-5.5 FC in June/July (sunny/swimmers). If you keep 9, with FC demand of 4 you will get to 5...flirting with cloudy.

You can even test and replace during the day if you have LOTS of sun and swimmers, 5 minutes, check, replace, swim.
 
Thank you everyone for your help! I added 64oz of liquid chlorine right after sun down and turned off the SWG. I'm let the pump run at 1500rpm for one hour and then recorded a FC of 9.5 and CC of 0. Alarm is set for 6am - stay tuned! I plan on just letting the pump run over night on low speed so I get a good reading in the morning.
 
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Well I took a reading at sunrise. It was light out but no direct sunlight if that makes sense at 5:15am. Results are 7.5 FC and no CC. So a drop of two but I'm not sure if that's partly because I didn't get out there while it was still pitch black dark. Water looks about the same, maybe a little better, maybe me being optimistic and without coffee!

Would I want to try and increase CYA up to 70 or SLAM up to a FC of 20 at my current levels until clear and then adjust CYA up after?
 

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I would do a proper OCLT, or SLAM it until you pass proper OCLT. Shouldn't take much. Either way, pass OCLT before your raise CYA.
 
She's back! Thanks for the help! As far as next steps, sounds like I need to get my CYA up to 70 and keep FC at 9. Do most people figure out what to set their SWG at to maintain those levels or do you supplement with liquid chlorine? I had the generator set to 30%. Not sure if I missed a more intelligent way to go about determining where it should be set to. Thanks again!
 

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Not sure if I missed a more intelligent way to go about determining where it should be set to. Thanks again!
Use "effects of adding" in pool math. In NJ, in summer a good place to start is target 4-5FC creation. Enter your pump run time and vary your cell % output until "effects of adding" shows you are generating 4-5FC. Use that pump run time and % output as a start. Then adjust %output on the cell to keep your FC within target for your CYA. Link-->FC/CYA Levels

If your FC is low (compared to target range), raise to target range with LC, maintain with SWCG.
Yes - I re-ran last night and passed.
Uefa Love GIF by Likee US
 
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