CYA Removal

[joemkraus]

I opened my pool today and CYA is at 20 vs 50 when I closed it for the fall. We had some heavy rain this winter so since I drained a few times I thought it would be lower, but not by this much. I also thought that CYA could ONLY be reduced by draining, but now I read the following on TFP.
"Users need to be mindful that their pool’s free chlorine levels will decrease after addition to the water. In the summer, an average pool may lose 3 ppm of FC per day, while it can take weeks to lose 3 ppm of CYA"

What? So it disspates on it's own!? That's new to me, any opinions

 

[ajw22]

CYA degrades during the winter.

CYA - Further Reading

www.troublefreepool.com

 

[joemkraus]

No Kidding! That great, thought I would have to drain this year, but find out I need to add some, OK cool thanks

 

[ajw22]

Where does my CYA go over the winter?

Every spring when I open my pool my CYA is way down, often too low to measure. What happens to it? I tested my CYA over the weekend and the black dot is still clearly visible even though I have one of the tall tubes that has a reading down to 20 - so I am somewhere less than 20. I thought...

www.troublefreepool.com

 

[joemkraus]

same for rme, less than 20

 

[kimkats]

I found it VERY ironic that after my first pool got RUINDED by VERY high CYA and VERY off balance pH/TA that I had to add CYA each spring as the rain causing me to drain often over the winter........Got to LOVE TFP for teaching me the ins and out of proper pol care!

 

[Newdude]

This year we got about a foot less rain than usual, per how much I had to pump, err... didn't have to pump out over the winter.

I was not surprised to have 30 CYA at opening when I'd usually lose all but an unreadable amount of my 70.

 

[mgtfp]

Make sure that you run your pump long enough after opening before taking tests and making adjustments. After winter the water can be quite stratified, with fresh rainwater at the top and heavier, saltier, old water at the bottom.

It can take a day of letting the pump run before you get reliable test results.