On the instructions on the CYA test it says fill with pool water to bottom line of tube but there's no bottom line other than the one that says 100?. But on the cya test tube I'm not sure if thats the bottom line I should use? Very frustrated because it looks like I have Ammonia in the water again. Very Frustrated to come across one problem after another. My PH read 6.8 and I cant get a FR reading even dumping in 4 gallons 12.5% bleach. Any suggestions?