Ok, thank. I was a little stuck on why to possibly put to smaller micron carbon filter 1st, but what you explained made sense.The idea here is to allow your sediment filter(s) to do their job (capture sediment) and allow your carbon block(s) to do their job.
By the time the water gets to the carbon blocks, if the micron ratings on all filters are designed correctly, sediment should be a non-issue. Maybe an example will help here:
BAD: 5 micron sediment->1 micron carbon (the carbon block will capture sediment between 5 and 1 micron)
If you use two carbon blocks, use your best carbon block (highest chlorine capacity) to handle the fully chlorinated water right out of the sediment filter. Use your lower capacity carbon block next to catch any chlorine that got past the first block.
Also - with few exceptions, there's no need for two carbon blocks on systems fed non-chlorinated well water.