I have noticed that when I perform the TA test. The color may change for a brief second from Green to pink but it takes another 2 drops before the change becomes permanent. So I record the amount to make the change permanent. I am doing the right thing?
I ask because I went for a water check at the local Leslie's pool. They told me that my TA is 50. When I repeat the same test with my kit, I do see this brief color change at 50 as described above but the color change only becomes permanent at 70.
Who is right?