I use hydroton in my DWC... i must say - it works awesome, but its a bitch to clean.

it will not change the ph of your water... and they are small, and pretty light... they wont crush your plants, or cut them - even seedlings...

hydroton gets my vote.
BloodShot420 Reviewed by BloodShot420 on . Can you use red lava yard-rocks for grow medium ? Iā??ve heard people mention ā??lava rocksā?? as a grow medium, instead of Hydroton. Are they talking about special lava-rocks sold at a grow store, or the red lava-type rocks used for landscaping, that people use in their front yard in place of grass ? The yard kind is probably very cheap compared to Hydroton (they probably sell it by the cubic yard like soil). What I wonder is: 1) does it release minerals into the solution that would raise/lower the pH ? and 2) does the rock being red Rating: 5