rockwool does not need a constant watering ,in fact it will not function as a medium if it is soaked ,it is designed to hold and retain air and water,if soaked constantly ,it will deteriorate and drown the roots,limit the cycles to 15 minutes every 3-4 hours,or use hydroton with a starter cube only,only increase the cycles as the plant grows,....bonbon
bonbon Reviewed by bonbon on . mental block about rock wool cubes are drving me crazy I took pictures and they didn't come out well enough to show anything. Thanks to notanovice for helping, at least now I know how to do it. I think that I solved my root rot problem and I think it was due to the rock wool deteriorating and contaminating my system. I follow instructions that I have gotten from all the great people who have given me advise. When I soak the cubes in 4.5 ph water for 24 hours, they seem soggy and not easy to work with when either putting in a clone or a seed. Rating: 5