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[Bob Marchese]

Ok, I opened the pool and the water is clear.
Below are the test results.
CYA, CH, and TA are pretty high. I will now drain 12" water and after refilling will test again. I hope this works.

9.0
FC
0.5
CC
7.8
pH
180
TA
900
CH
100
CYA

 

[ajw22]

Did you let your CYA water sample warm up to room temperature before you added reagent and run the CYA test? At 40°F the CYA can test higher than its actual value.

You still may have high CYA but not that high.

In addition if your CYA test over 90 you should do the dilution test...

CYA > 90 dilution Test​

For CYA > 90ppm, repeat the test adjusting the procedure as follows:

1. Fill the mixing bottle to the lower mark with pool water.
2. Continue filling the mixing bottle to the upper mark with tap water.
3. Shake briefly to mix.
4. Pour off half of the contents of the mixing bottle, so it is again filled to the lower mark.
5. Continue the test normally from adding R-0013, but multiply the final result by two.

If you need to dilute the pool water further then apply these ratios:

Pool water	Tap or distilled water	Multiply result by
1	1	2
1	2	3
1	4	5

Note that when doing a diluted test not only do you multiply the range of the test you multiply the error rate of the test, so results are a ballpark - not an absolute.

See CYA Testing for tips in how to read the test results.

 

[ajw22]

With your CH of 900 and your CYA of 100+ you need to drain at least 50% of your pool to cut those numbers in half.

How do you chlorinate your pool?

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