Cannot maintain FC level

[Mark E]

I am having trouble maintaining a FC level. Ph and TA are ok but Cya was at 100. I drained 50% of my 26K pool refilled. Added 3.5lbs of Leslies power powder plus. 5 hours later tested no FC added 2.5lbs more and retested the next morning again no FC. Took a sample to Leslies Ph and TA ok but Cya still at 100.
Is the high Cya my problem? why did it not reduce with dillution? Do I keep adding chlorine or drain to further dillute.

Any suggestions.

Thanks,

Mark

 

[jblizzle]

The CYA test maxes out at 100ppm, you you may have been well above that.

How are you getting your test results? Pool stores are notoriously bad at the CYA test.

 

[Patrick_B]

And what is in that power powder? Cal hypo, or trichlor/dichlor? You may be putting CYA right back in with that stuff. I just don't know what product it is.

EDIT: I looked it up, it's cal hypo, so at least you aren't adding CYA. It isn't CYA keeping you from having FC, but there is way too much if the test is right. What test are you using for FC? Can you test for CC? If not, it will be difficult to make a solid recommendation to you. You may have something consuming your FC, it may be something else. More info really is needed, I'm sorry. I cannot encourage you strongly enough to get a good test kit and rely on your own numbers, and understand what they mean. It's really pretty easy and things will be much better for you and your pool in the future.

 

[SkyKid]

Made from powerful calcium hypochlorite,
I didn't know there was a weak calcium hypochlorite