New pool owner here and I'm trying to get a handle on my water chemistry. Last night I measured my TA with the TF-100 kit and I'm wondering about the instructions that say to add drops of the R0009 until it turns red. Does "red" really mean red? My solution turns to pink after 3 drops and gets a little darker with subsequent drops, but it never gets red, just dark pink. So do I stop adding drops when it first turns from green to pink, or keep adding until it really goes to red (not sure if it ever will).