Fifth of July Haze

Johnny-M

LifeTime Supporter
May 11, 2012
123
Altoona, Pa
Just a quick question and any help or guidance would be appreciated.
Pool has been perfectly clear for over a month.
I checked FC yesterday before party it was 8ppm
Yesterday I had a heavy bather load 25-35 people in the pool. Went to add CL to pool after the party and noticed a haze to the water.
Added CL up to 16.5ppm
Readings this morning around 8:30 were
FC 16ppm
CC 0 ppm
PH 7.5
CYA 45
Borates 30

What could cause the haze if FC has been around 6-8ppm per day.
Should I add clarifier or just let the filter work today. I did add a cup of DE to the filter this morning.
Its not bad, but its not perfect! :?
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,629
SW Indiana
Keep an extra close eye on your chlorine and run the filter around the clock. That kind of bather load will often create issues with both biologicals and sunscreen etc..
 

Leebo

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TFP Expert
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Jul 21, 2011
9,067
Eastern Ohio
If your party was like our party, then I'd guess it was from your brother-in-laws lighting off mortars into the air, and not listening when you're telling them 90% of the paper, sawdust, and whatever else is in them is landing in the pool area. But if it were just swimmers......let the chlorine do it's thing.

Anybody wana clean out a pool full of fireworks. :(
 

Johnny-M

LifeTime Supporter
May 11, 2012
123
Altoona, Pa
I thought I had the FC up high enough to prevent the haze, and when the CC were reading 0I I couldn't figure out where I went wrong. Still learning I guess.
 

dattia

LifeTime Supporter
Jun 12, 2008
520
West Chester, PA
You took a good preventive measure, but you can't always be sure how your pool will react to bather loads, temperatures, etc. The good news is, with test kit in hand, you can take the steps necessary to remedy the situation.
 

duraleigh

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In The Industry
Apr 1, 2007
32,863
Sebring, Florida
Putting a higher FC in the pool PRIOR to swimming might have been a little more helpful but that is a really big swimmer load and I think you temporarily overwhelmed the system.

Like other have said, let the chlorine do it's job. :lol:
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
22,069
San Dimas, CA (LA County)
Johnny-M said:
I know I need POP, but normally how long will the haze last and should I keep CL at shock level until back to normal?
I don't think I'd run it all the way up to shock, just the high end of normal. I'd worry if the pool wasn't pristine again in 24 hours.

There's always the test kit to ease your mind.
 

chem geek

TFP Expert
LifeTime Supporter
Mar 28, 2007
12,083
San Rafael, CA USA
Chlorine doesn't oxidize every chemical instantly and it doesn't oxidize some chemicals at all so you need to give both the chlorine and the circulation/filtration some time to recover from the heavier bather load. It should get clearer in a day or two. At least now you can appreciate why it is difficult for commercial/public pools to remain clear, though they are supposed to circulate the water more frequently. Having 1 bather per 1000 gallons, as in your case, is heavy bather load. One bather in 1000-5000 gallons is moderate and one bather in 5000 gallons or more is light.
 

Johnny-M

LifeTime Supporter
May 11, 2012
123
Altoona, Pa
Thank you for the education. I do appreciate it greatly. It naked ne ask what so the public pools so differently to prevent this? Is it different chemicals or just a greater filtration system. If I had to do it again I think I would request a bigger sand filter maybe 600#I and a two speed pump. Not the one they sold me with the pool. Ignorance on my part.
 

Johnny-M

LifeTime Supporter
May 11, 2012
123
Altoona, Pa
Thank you for the education. I do appreciate it greatly. It naked ne ask what so the public pools so differently to prevent this? Is it different chemicals or just a greater filtration system. If I had to do it again I think I would request a bigger sand filter maybe 600#I and a two speed pump. Not the one they sold me with the pool. Ignorance on my part.
 

JasonLion

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May 7, 2007
37,879
Silver Spring, MD
Public pools have larger filters and larger pumps, relative to the size of the pool. They and also tend to use things in addition to chlorine to increase the rate of oxidation of bather waste. They also don't normally have as many people swimming per gallon of water as you did.

After a large pool party it is common for the water to cloud up for about 24 hours.
 

chem geek

TFP Expert
LifeTime Supporter
Mar 28, 2007
12,083
San Rafael, CA USA
And if you've been to a heavily used public pool, I wouldn't exactly say the water is crystal clear, at least not in my experience. For those that are, they do the things Jason wrote and possibly use more coagulants (clarifiers) as is done in Europe under DIN 19643 though that's also to help reduce disinfection by-product formation. The dullness is not unhealthy so long as there is still a proper Free Chlorine (FC) reading. It's only a serious issue if it becomes so cloudy that you cannot see the main drain with some clarity since then it becomes a safety issue not being able to see a drowned person at the bottom of the pool.
 

Johnny-M

LifeTime Supporter
May 11, 2012
123
Altoona, Pa
it has been three days and a little bit of improvement. Pool is not crystal clear like normal. It is "dull" if that makes any sense. I did put some clarifier in and that really didn't do muck. CL has been around 13-16ppm each day since the party PH is 7.5. I guess it needs some more time? No more 75 people pool parties from now on.
 

Johnny-M

LifeTime Supporter
May 11, 2012
123
Altoona, Pa
Yes the OCLT was perfect. 0 CC in the pool at all. There is a black ring around the skimmers that wasn't there before. I am assuming it is lotion or oil..
 

linen

TFP Expert
LifeTime Supporter
Jul 30, 2010
8,649
Twin Cities, MN
I would still keep your FC up at shock level (I get 16ppm for your 45 ppm cya from PC) for a couple days, since your cloudiness is really persisting. I would redo the OCLT just in case.

What is are current TA and CH levels?