# Thread: CYA levels, need someone good at math

1. ## CYA levels, need someone good at math

CYA levels, need someone good at math

over 6 months

a 50lb bucket of tricholor pucks would raise the CYA of a 15,000 gallon swimming pool by how much?

thanks, steve

2. ## Re: CYA levels, need someone good at math

222 according to Pool Calculator. You'll lose some of that to splashout and backwashing, but it's still way too high

3. ## Re: CYA levels, need someone good at math

yup, gonna have to switch to liquid bleach

thats what i figured. I have CYA of 110 with tf 100 test kit.
the dip in the water test strips screwed me, totally innacurate

so will probably have to do 2 step 40% drain and refill and start using liquid bleach

4. ## Re: CYA levels, need someone good at math

Sounds like a good plan

5. ## Re: CYA levels, need someone good at math

Keep in mind that the standard CYA test will show anything over 100 as the same thing. So you CYA level might be much higher. You can do the test with dilution to get an idea if your actual CYA level is close to 100 or close to 200, though you lose most of what precision there is. Mix equal parts of pool water and tap water, do the test on that, and multiply the result by 2.

6. ## Re: CYA levels, need someone good at math

Just be aware that the test is not that accurate at levels over 100, you might be better off retesting diluting you sample 1 to 1 with tap water then multiplying your result by 2. This will introduce its own error, but it will likely tell you if your in the right ballpark with the 110 reading, as that could well be 150 or 200 on the straight test.

7. ## Re: CYA levels, need someone good at math

just drained 1/3 of water and refilled. got my CYA down to 65-70 area, got some heavy rains coming so will be back washing it to drop it a couple more points.

so 1 tricholor puck in a 15,000 gallon pool with raise the CYA by how much?

just curious.

8. ## Re: CYA levels, need someone good at math

Originally Posted by smooth2222
so 1 tricholor puck in a 15,000 gallon pool with raise the CYA by how much?
How many pucks in 50 lbs, maybe 100?

If yes, then 1 half-pound puck would raise the CYA in 15,000 gals by 2.22 (assuming that Richard's original answer was correct).

9. ## Re: CYA levels, need someone good at math

Go to the poolcalculator.com and put your pool size at the top. Then at the bottom you can see what adding different chemicals will do.

A 7 oz puck will raise FC by 3.2, CYA by 1.9, lower pH by 0.17 and raise salt by 2.6
A 8 oz puck will raise FC by 3.7, CYA by 2.2, lower pH by 0.20 and raise salt by 3.0

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