Can I shock if my cya is 0?

YOu certainly can but the buffering affect of around 20ppm CYA makes your FC a little easier to control. Don't tryto shock with your SWG...use Clorox. Why is your CYA zero with an SWG?
 
Sounds like you need to go shopping for stabilizer and bleach....

What are your full test results?

Posted with Tapatalk ... sorry if I sound short ... hate typing on phone ;)
 
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