- Nov 7, 2012
- 81
jblizzle said:23 drops of R-0871 is only 11.5ppm of FC. That is no where near the correct shock value for a CYA of ~100ppm.
According to the Pool School chart, your shock FC level is ~39ppm ... that would be 78 drops!!! Which is why we generally recommend getting the TF-100 which has a lot more R-0871 ... and even suggesting the XL option which includes even more powder and reagent ... if you are having to perform the shock process.
Try the CYA test with 50/50 mix of pool water and tap water, then double the test reading. If you still have the current mix in the bottle, dump out half and refill with tap water and then double the test result (this should work for CYA levels that are not too high ... like 200+)
I stopped at 23 because I know it would be around 70-80 drops the way it was going and I would run out. I will try the suggestion of the CYA test.