We are in the process of having an 18x36, in-ground, vinyl lined pool, with SWG installed. Weather permitting, they should be done with construction at the end of the week. I have been searching and reading this site and have found a wealth of information. I am going to order a TF 100 test kit. My question is this: When using the TF 100 kit, is there still a need to have a pool store test the water, or is this kit all inclusive?