Testing CYA with TF-100

sd72667

Well-known member
May 19, 2010
65
Evansville, IN
OK, First time using the TF-100 kit. I fill the CYA mixing bottle under the label, I add R-0013 to above the label. Shake, wait 30 sec, shake, I then hold C A tube at waist and slowly fill. So when the black dot disappears, that is my reading? Does the water become cloudy in the tube? I filled the tube and still could see the black dot. What am I doing wrong? Or is it that my CYA level is very low and need to add some?
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,475
SW Indiana
If it's staying clear you don't have much CYA. The water will be cloudy. The more CYA, the cloudier the water.
 

svenpup

LifeTime Supporter
Nov 18, 2009
835
Sacramento, CA
Tap water doesn't have any CYA, so that is normal. You should add 30-50ppm right away to protect FC from sunlight. Without any CYA your FC will be gone in a matter of hours.

You should always get a reading for pH, CH, and TA. FC can be 0.

You should post a full set of numbers to get feedback.

How are you chlorinating?

ETA: To clarify, FC in fill water may measure 0 or low...you should never let it go to 0 in your pool. Ever.
 

sd72667

Well-known member
May 19, 2010
65
Evansville, IN
I have a SWG for adding chlorine. I have to head to work now but I will add the CYA early tomorrow. Where exactly does someone purchase CYA? Any Pool store?
 

svenpup

LifeTime Supporter
Nov 18, 2009
835
Sacramento, CA
Pool store will definitely have it. Home Depot/Lowes/WalMart if they have a pool aisle. It is also called stabilizer.

With an SWG you actually want more...70-80ppm.
 

sd72667

Well-known member
May 19, 2010
65
Evansville, IN
I actually have a pool store 2 miles from where I live. So I ran down there and purchased the stabilizer. It says 1LB per 5k gallons. I added it to a sock and tied a knot and put it in the skimmer for now. How long before it starts raising the CYA? and dissolving?
 

dmanb2b

TFP Expert
LifeTime Supporter
Apr 4, 2009
3,734
NY
About a day or two, but wait a week to test.

Now would be a good time to add pool details to your signature so we can help you better :goodjob:
 

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