I'm converting to salt, and I need a new test kit. I have the TF-100 but everything in it is old. I like the TF Pro, should I be using that one? I must confess I've been going to the pool store for my testing. I know I should be testing myself, but my reagents are old and I've been extremely frustrated (to the point of wanting to fill in that big hole with dirt and call it a day) dealing with staining on my 1 year old plaster and now black algae. Thanks for any advise!!!!