When I am testing the FC in my hot tub, the water turns light pink after I first put in the powder, but gets darker as it swirls for a few seconds. Also, when I add the drops to test the FC level it initially clears, but if I let it sit a few seconds before testing for CC, the sample starts turning pink and even red again. Do I count the drops until the sample first turns clear to get my FC reading or keep counting until it stays clear. The CC level is also quite high (4). Is that's what's causing the issue when I'm testing for FC? It's my understanding that shock level should be 10x CC. So, do I bring the FC all the way up to 40?