/diy/ - Do It Yourself

>>2759251
If all your adsorbent touches all the air at once, you don't get to use the maximum capacity, which happens to be highest for activated alumina. Suppose 15% RH is okay, then you can get by with 40% as much zeolite (holds 8 mol water/kg) as alumina (3 mol water/kg). Both cost about the same ($10 / 100 g). Silica gel holds even less at 15% RH (2mol/kg) but it's much cheaper ($2.5/100 g).