Hi! Ok so TF XL test kit finally arrived! There were zero directions in the kit except for what was in the blue Taylor OTD kit. I was able to piece most together from videos and instructions here on TFP (thank you). However, re:TA, in TFP instructions it references "Fill the sample tube with pool water to the 25 ml mark. The top of the sample will be curved. This curve is called a meniscus. The bottom of the meniscus should be level with the 25 ml mark." What does that mean?
thanks!!!
thanks!!!