Build my own test kit?

[SabrinaMott]

Would it be possible to create a recommended test kit by adding only the reagents that I am lacking? Currently, I have a Pentair rainbow kit that includes OTO, Phenol red, Acid demand/total alkalinity solution, chlorine neutralizer, total alkalinity, and 2 water hardiness reagents. If so, what would I need to add?

 

[Griswald]

Practically everything...much easier and cheaper to get the TF100

 

[Isaac-1]

I tend to agree, unfortunately the tests you are missing are the more expensive ones in the set