My routine is much like HotTubGuy's.
For my Marquis Wish I use the Frog Bromine cartridges in the inline system. I replace the yellow cartridge monthly, which is also how often I clean and swap out the filters (I keep two sets). The blue mineral cartridge gets replaced when I replace the spa water, every 4 months. Once a week add some shock and check & balance the chemicals. I'm sure others do it differently but I've found the TrueTest Digital meter and strips to be easy to use and accurate enough for my needs. There are two types I use the red one, which is made specifically for bromine systems.
Also weekly I add a little clarifier (Clear & Sparkle), Enzyme Clear, Foam Free, Spa Defense scale preventer.
When I replace the water I first use a Spa System Flush in the old water, to drain I use a Little Giant submersible pump (much quicker than draining), and when filling I put a PreFresh filter on the hose.
To clean out any grit that manages to get into the spa I use a Spa & Pool Pump Vacuum and a little Grit Gitter Spa Vac.