Just had this thought - what if you put desiccant directly into a large fill tank? Would this help with absorbing any residual air that gets through the from the compressor?
A proper compressor will adhere to the EN12021 standard and pump no moisture into your tank. Even if it did then what would you do when the desiccant get saturated? And how would you tell?
The quality of air from compressors can vary substantially and it is important to ensure that you are certain that the air being supplied is suitable to be supplied for breathing air purposes | Breathe Safety