In Chicago here we got a heatwave . I noticed my pool been tearing through chlorine ... Did a CYA test with TF100 came up 0, i could clearly see the black dot filling all the way up the tube.... Added 16oz of stabilizer per pool calculator in a sock over the return. I test water today , same 0 ... Does it take a while for stabilizer to register on cya test? .. I would hate to keep adding stabilizer to find out i added too much.