I've been using this test for a while but since I've started shocking the pool I'm getting odd results with the test. It normally goes completely clear when adding the drops but the last few times I've tried it never gets clear no matter how many drops I put in it. I've also had to add about 2 scoops to get the sample to turn pink but I think I read on here that thats not uncommon. Has anyone ever had this happen? FC should be about 30. CYA is 70. Could water temp affect it or am I doing something wrong?