I have worked ebb and flow with rockwool slabs, but I really don't think that rockwool is the best media for a drip system. I would be pleasantly surprised if someone would really think that its the best system... although it would probably work.

I feel the clay pellets/hydroton is really the best and easiest to regulate. Rockwool takes so long to dry out, and I feel if you are not right on, you may well end up with some kind of root rot. No problem with hydroton. Other advantages come at harvest time. You have those expensive slabs, all wet, to get rid of. I rinse off the hydroton and it can be re-used..... a lot less to take to the garbage can...
SpaceNeedle Reviewed by SpaceNeedle on . Q about drip system I have my girls in a 28 site drip system (have only 24 plants though). They are in a rockwool slab medium. I am just starting week 6 today. My question is about drip times. I have the pump going 4 times a day (every 3 hours) for 5 minutes. The slabs seem moist but not saturated. The leaves do not seem droopy like they have been overwatered. I would just like to know if someone has a similar type system and medium, and what their times are. Also, I have read that it is good to flush the Rating: 5