I had a test kit when I put in an in ground pool 8 years ago. Ended up buying test strips, because they are quick and easy to read. When I moved to a house where an in ground pool was not possible, I installed an above ground pool. I have been using test strips, because my friends down the road have used test strips for 20 plus years and their pool is always beautiful......but he is also a chemistry teacher. I teach Kindergarten, so I guess that is where I am lacking (haha). Where is the best place to order a test kit? Also, is this test kit going to tell me what the crud on the floor of my pool is, and how to get rid of it? After dealing with it for over a year, I am weary.