How to Dry Compressed Air

When my old Craftsman compressor quit after 15 years or so I replaced it with a DeWalt as shown in the first post. I removed the compressor from the Craftsman tank and hooked the tank in series to the new DeWalt.
Most of the moisture is in the DeWalt tank, like serious water, and just a little mist in the 2nd tank. I run a few drop leg drains throughout the shop.
A cheap inline drier for the few time I spray anything.