CYA Level Still Low

[poolman10]

CYA level in our ~28k gallon pool at the start of the season was -0- (using a k2006 kit). Per the pool calculator, I added 9 lbs. of granular stabilizer to get the level to 40. We are going through a gallon of bleach a day, so I tested CYA and, though the test water is hazier than when I tested at the start of the season, I can still see the dot at the bottom of the tube at the -0- level. Should I add another pound or two and see what happens?

Water is clear and combined chlorine is <1.

Thanks for your thoughts.

 

[Butterfly]

Yes, you need to add some, but, what is the % cyanuric acid listed in ingredients on the jug you are using?

 

[pwrstrk]

How long did you wait to take your test after adding the CYA ? It can take a week to fully register.


Sent from my iPhone using Tapatalk.

 

[poolman10]

Thanks for your replies.

I don't have the container anymore but it was HTH conditioner/stabilizer from Walmart. I think I've seen elsewhere that it is approx. 97%. I last added it to the pool about 3 weeks ago, so should be fully absorbed.

I've already added 9 lbs. Think I should start by adding an additional 2 lbs.?

Reading the CYA test is difficult!

Thanks.

 

[pwrstrk]

Are you doing the test with the sun to your back ?


Sent from my iPhone using Tapatalk.

 

[poolman10]

Should say that reading the test can be difficult for middle-aged eyes. Have to make sure I bring the reading glasses out to the pool. Yes, I rely on the sun to help me, or just a bright blue sky.

 

[pwrstrk]

I hear ya on the eyes. I use my reading glasses.


Sent from my iPhone using Tapatalk.

 

[Suziqzer]

Did you backwash shortly after you added the stabilizer?

 

[poolman10]

I put the stabilizer in a stocking in front of the return rather than in the skimmer, so am assuming backwash not an issue?

 

[Suziqzer]

You shouldn't back wash until the CYA has had a chance to fully dissolve, or it can be washed out when you back wash.

 

[pwrstrk]

How about rain ? I had to raise mine up a little. We got any where from 9-12 inches of rain for June.


Sent from my iPhone using Tapatalk.

 

[poolman10]

Will definitely hold off on backwashing after adding stabilizer, even if adding via stocking. Thanks for the tip.

Yes, we had almost a foot of rain here too! I believe I added most of stabilizer after the rain.

So if the test is registering a hazy -0-, should I just add a couple of pounds and see where that goes?

 

[pwrstrk]

Yea go ahead if your confident on your test levels.


Sent from my iPhone using Tapatalk.

 

[pwrstrk]

Also remember the CYA will also lower your PH.


Sent from my iPhone using Tapatalk.

 

[Suziqzer]

You can go ahead and do that and see where it gets you. You might have someone else there when you test again to see what they get as a result. Since it is a different test to get used to, it's not a bad idea to have another set of eyes sometimes.

Also, are you sure you put in 9 lbs the first time? I don't think the Walmart here sells anything that large.

 

[poolman10]

Thank you all for your comments.

Jeff - I feel pretty confident about the test and I used new reagent. Just doesn't seem right that I add 9 lbs. and the test is showing close to -0-.

Suziqzer - yes, I added two 4 lb. containers and part of a container from last year to get 9 lbs.

That dot at the bottom of the tube will completely disappear, right?

 

[JohnN]

Yep, dot has to be completely, totally invisible.