how did my cya get this high?

[jmikeb]

my pool is only 11 weeks old and my cya is over 200. in those 11 weeks, 25lbs of 1"" tri-chlor tabs have been used. do those tabs contain enough cya to make an 11k gallon, IG, fiberglass pool read 200+ppm?

 

[Donldson]

25 lbs of trichlor in 11k gallons water will add 150 ppm CYA to your water. Some CYA was probably added at startup, either independently or through dichlor shock, so yes this sounds about right.

In the PoolMath tab above you can put your pool volume in and go to the bottom for the "Effects of adding chemicals" section to verify my numbers.

 

[jmikeb]

thank you