Algae, cloudy water and foam on the surface

y51

Active member
Jun 27, 2011
34
Illinois
Hello everybody - I need your help.

I am not very new to the pool maintenance, but I see this the first time.
I have opened the pool 2 days ago and found a lot of algae.
I've added 2 gallons of 6% bleach.
Yesterday, I've tested the water:
Salt -2500 ppm - added 20 lbs of salt
FC - 2 ppm - did not add anything
CYA - 40 ppm - added 2 pods of HTH stabilizer,
TA - 70 ppm,
pH - 7.3 -added 13 oz of pH+
CH - 125 ppm - did not add anything
Tomorrow, I was going to start the SLAMing the pool, but just now I've found a lot of substance that looks like a foam, but is very thin.
Photos are attached.
Please advise,

Thank you very much,
 

Attachments

Donldson

TFP Expert
LifeTime Supporter
Jun 12, 2009
4,422
NW Ohio
What kind of bleach, specifically, did you add? That's a likely culprit.

BTW, why did you add something to raise the pH? If you intend to start a SLAM Process tomorrow then you will want your pH to be around 7.2.
 

y51

Active member
Jun 27, 2011
34
Illinois
I used concentrated bleach 6% Sodium Hydroxide from Meijer.
About pH: I tried to bring it to 7.5 (the upper range in recommended by TFP). At some reason, it did not change, now it is 7.22. I checked it with two methods.
The foam is gone. I believe it was due to air in the filter.
Now, my test results:
Salt -2500 ppm
FC - 3 ppm
CYA - 50 ppm
TA - 70 ppm,
pH - 7..22
CH - 100 ppm

Should I SLAM the pool if I have just cloudy slightly greenish water? Or just use HTH Super Algae Guard 60?

Thanks for your help!
 

y51

Active member
Jun 27, 2011
34
Illinois

y51

Active member
Jun 27, 2011
34
Illinois
Please help!
I have the same problem - no liquid bleach.
I can get cal-hypo 56.44%.
Can I use it for SLAM?
My current CH is 100ppm, pH+7.2, CYA=50, TA=70
Thank you very much.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
29,767
Laughlin, NV
You can use cal hypo if absolutely necessary. Be sure you fully get it dissolved because if it sits on your liner, it will stain it. Also look for 73% cal hypo. More chlorine.
Be sure you look at Home Depot, Menards, Lowes, farm stores, Walmart, etc. for liquid chlorine.
 

IceShadow

Gold Supporter
TFP Guide
Jun 8, 2019
2,177
Milwaukee, WI
I am finding tons of liquid chlorine for sale here in Wisconsin and I can’t imagine Illinois is that different. Have you looked for the liquid chlorine meant for pools?
 

y51

Active member
Jun 27, 2011
34
Illinois
Richard 320, mknauss and IceShadow,
Thank you for your help. I was lucky to find 10 gal of liquid bleach 8.25% in the Blain's Farm and Fleet (I forgot about it and searched in Menards, Lowes and Walmart).
I am going to start SLAMing tomorrow.
Thanks again(y)
 

y51

Active member
Jun 27, 2011
34
Illinois
Strange behavior of FC.
I,m SLAMing my pool the third day.
I have strange readings of FC:
Day 1: 10 am - FC=4, CYA=50 - added bleach per PoolMath calculator up to FC=20
1 pm - FC=1, CYA=50 - added bleach
5 pm - FC=11, CYA=50 - added bleach
Day 2:
I've missed the opportunity to do the OCLT, because woke up too late
11 am - FC= 10.5 CYA=50 - added bleach
4 pm - FC= 22 CYA=50
8 pm - FC=19 CYA=50 - did not add the bleach - making the OCLT
Day 3: 6 am - FC = 10 CYA=50
11 am - FC=7.5 CYA=50 - added bleach
3 pm - FC=22,CYA=50
The strange thing is the increase of FC two days.
Water is not green anymore, slightly cloudy.
Robot is working all day cleaning the pool.
Pump and filter are 24m hrs on.
I'll appreciate any suggestion.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
29,767
Laughlin, NV
Is your SWCG on?

I do not see the increases except when you added bleach. I must be missing it. Test data looks pretty normal to me.
 

y51

Active member
Jun 27, 2011
34
Illinois
2nd day, at 11 am, I added bleach to make FC=20, but at 4 pm FC=22. Should drop due to sun, but has increased
3rd day, at 11 am, I added bleach to make FC=20, but at 3 pm FC=22. Should drop due to sun, but has increased
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
29,767
Laughlin, NV
Liquid chlorine can be stronger or weaker than the concentration shown on the bottle. So slight variations are not unusual. Testing error, etc. also play a part.

I would not be deterred by those couple tests. During a SLAM you can get into a stalemate and then when you brush or vac you disturb more algae and the chlorine attacks it.
 

y51

Active member
Jun 27, 2011
34
Illinois
Thank you mknauss,
I'll continue.
How long this may take?
I have CC =0 and need to pass OCLT and get clear water. Looks like I should expect a long way to success:(
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
29,767
Laughlin, NV
If your posted data is all you are testing and adding, it will take awhile. Best if you can hit early am, noon, mid afternoon, early evening, before bed.

Watch your filter pressure. Once it rises by 25% over clean pressure be sure to clean the cartridges.

Brush daily, twice if you can.