New Pool owners - green on bottom of pool

manyxblessed

Member
Sep 22, 2018
10
Tallahassee, FL
These are our numbers:

CYA - sample not cloudy at all
FC -0 (no pink)
CC - 1
PH - 8.0
AK- 150 PPM
CH - 190 PPM
Salt (can't test yet, need recommendations on best way to test)

We just put a sock with CYA in it....80 oz. and running pump.
Not sure where to go from here. Do we go ahead and add chlorine?
We have an SWG
Thanks for any help.
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,621
SW Indiana
Welcome to TFP!

Chlorine is the most important thing to worry about. Liquid Chlorine, liquid shock or unscented laundry bleach are the best choices. You probably need to follow the SLAM Process process to get a handle on it. Get your salt test from TFtestkits.net
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
22,449
Laughlin, NV
Once you start to dissolve the CYA in the pool assume the amount you added is in the pool water and start the SLAM using that CYA for your shock level FC.
 

manyxblessed

Member
Sep 22, 2018
10
Tallahassee, FL
Okay, so assume CYA is at 30 even if it is salt water? To lower PH it says 49 oz of muriatic acid....and to go from 0 to 28 FC it says to add 836 oz of 6% bleach. (The bleach is household bleach, no scent.) Does this sound accurate?
Thank you so much for all your help!
 

Derb22

Gold Supporter
Apr 29, 2018
299
Roswell GA
Yes you don’t want to raise CYA above that because you have to hold an ever higher FC to SLAM. I came out with 58 oz. of MA and your number is correct for the FC.

- - - Updated - - -

That was assuming going from 8.0 to 7.2 based on your earlier numbers.
 
Last edited:

Derb22

Gold Supporter
Apr 29, 2018
299
Roswell GA
I just reread his posts. 80 oz in a sock is going to put him way over 30. I think he should take the sock out and measure the CYA tomorrow morning or he is going to over shoot CYA.
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,621
SW Indiana
I just reread his posts. 80 oz in a sock is going to put him way over 30. I think he should take the sock out and measure the CYA tomorrow morning or he is going to over shoot CYA.
With the SWCG the OP has, 70ppm is the recommended CYA level, so 80oz will only get it a little over halfway there.

No need to take it out. SLAM the pool based on all the CYA being in there which will put you around 40ppm and ignore everything but FC until the SLAM is done.
 

Derb22

Gold Supporter
Apr 29, 2018
299
Roswell GA
If you leave the sock in I would SLAM for a level of 40 CYA. that would mean holding FC at 16 instead of 12 for the slam. According to pool math your 80 oz of CYA will bring the level to 40.
 

TFRoger123

Active member
Jul 22, 2018
38
Babylon
Question...

I also have green (dead algae) at the bottom of my pool. Why wouldn't vacuuming be the first thing to do prior to adding chlorine or cya? I figure get rid of as much of the solid material as possible first before adding chemicals.
 

Pbj111

New member
Aug 9, 2018
4
Orlando, Fl
True. Although if their ph really is 8 and ta 150, it should be pretty close. Hard to use a pool test kit to know 8 ph from 8+. Just chiming in to mention that the ph effects of cya should be taken into account.

Thanks for the welcome. I've been a long time lurker. Lots of good info here.
 

manyxblessed

Member
Sep 22, 2018
10
Tallahassee, FL
If you leave the sock in I would SLAM for a level of 40 CYA. that would mean holding FC at 16 instead of 12 for the slam. According to pool math your 80 oz of CYA will bring the level to 40.
We have been working on the SLAM. The pool is clean looking. We forgot to take the FC last night. I'm not sure it does not have a very slight haze...not sparkling.....
FC 8
CC 0
CYA 50
PH 7.8-8
TA 160
Do we need to continue SLAM and raise FC again? or do we start to try and adjust the PH a bit and continue to raise the CYA. At present the original amount of stabilizer is at 1/3 the amount we had in the sock. It originally did not fit in the skimmer, but it fits now and is inside of it. My husband (this is wife) put the sock with the stabilizer in front of an inlet.
I still don't have the ability to test for Salt. I can take it to Leslies.
Thanks for all the help!
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
22,449
Laughlin, NV
As your FC is below 10 your pH of 7.8 is correct. Adjust that using acid for a pH of 7.2.

Raise your FC back to 20 ppm and maintain that until you pass the three criteria. Squeeze the sock some to dissolve the CYA granules.

Take care.
 

manyxblessed

Member
Sep 22, 2018
10
Tallahassee, FL
Last night:
FC 8.6 (thought it was low, but decided to test again this morning to see if it would pass the test)
ALk 170
CYA 70
PH 8
Salt 3600

This morning
FC 6.4

Keep on with SLAM and bring FC back up?