I text out a roll call to my techs once a week or every other week to see what chems levels are on the truck and at the shop for the ones I want to order in bulk. My techs have gotten really good at letting me know when tubs are getting low so I am not scrambling to refill. As far as parts, we are still at the level of order as you go / get approval.

We utilize the shopping list on skimmer. When the guys grab their trucks from the shop every morning they stock up at the shop. We keep a pretty good amount of chemicals etc. at the shop. Then I will usually take a look at inventory daily and add things to the shopping list as needed and order them when I order my stock orders. Its old school but it works.