Review on Lightweight HydroBalls Expanded Clay Terrarium Substrate by Zoo Med, 2.5 lbs by April Scott

Not bad actually. I bought these for my hydroponic plants and so far they are doing the job. Had to rinse it several times before use and it doesn't crush a lot of pebbles. My only complaint is how small the pebbles are. I have to put cotton balls in my mesh baskets because they keep pushing out. Again, they were designed for reptile habitats, not plants, so I don't blame them for that.