Filling hollow tubes of my component racks


I'm thinking of using pea gravel and either clay cat litter or sand to fill the legs of my Rack Of Silence 4 component rack and ROS 1 amp stands. Any thoughts if this is a "good solution" to not using shot. Can I put in too much and "kill" the sound?
Thanks for any help offered!!!
samhar
Stanwal and Hevac sorry for the delayed response I've been trying different combinations of tubes in the Joules and the C/J(tubes kept going south) and haven't experimented with the cat litter and stone mix in the tubes yet. I'll post my results.
Put 8" of mixed 50% clay cat litter and 50% 1/8" Mexican stone into the 33" tall ROS-4 posts. This amount dampened vibrations most noticeably in the bass but the highs did become slightly cleaner.
Added another 4" to the posts, the highs became cleaner and the bass snapper. So far so good!!!!
Tomorrow I'll add another 4" and hear what I get!
Well it only took one year for me to be ready to move the CD player off the central rack and onto an adjacent rack and fill the tubes to the top!!! This cleaned up the sound from the TT especially the very low end.

Stanwal I will get some Micro Bearings/steel shot next now that I don't have to consider the CDP's sound!!!