I mean there are a lot of other foams that I think could hold more water. The reason for this quetion is that I find myself filling the credo 1 or 2 times a week, I don't think the florist foam soaks up much water. At least not mine. My humidor is a small one (40 count I think) and I live in florida (very humid) I tried the crystals in the small jar and it worked perfectly for a couple of weeks but then I got mold in the jar and it also took some of my precious space. So I went to the foam again with 50/50 solution, then when I refill I have to let the foam soak in the d-water for 20 minutes or so. You would think that it comes out dripping water? No. I think that it is an issue of the foam not holding in enough water. Has anyone tried using a regular 3M sponge from the grocery store? I recently purchased a drymistat tube to help me out in the days that I'm feeling lazy, but i really want to put the credo to work. Any thoughts on this?