i would never reuse rockwool. but dont you have to replace lava rock after awhile just like hydroton? i know after awhile with hydroton calcium, and salts build up on the hydroton and that its impossible to wash/reuse, even with a flushing agent.
cigarettes42 Reviewed by cigarettes42 on . "Suckit Bucket" DIY thread You will need: 1. Drill, 1" drill bit, 1/2" drill bit 2. 1/2" 1/2" stiff black water tubing, 1/2" 5/8" clear hose, and garden hose. 3. >370 gph pond pump, with at least 12 foot height torque-rating. The stronger the better. 4. 3" hydro net basket 5. 3" pvc pipe 6. 3" pvc pipe end piece 7. There are some other small fittings that I will describe later. 8. 5 gallon bucket Rating: 5