Got the master of all plans for that here and my hubby gets the credit:
1. TWO 5 gallon orange buckets from Home Depot
2.
Hubby with Dremmel drill takes one bucket and drills little holes into the bottom
3. Stack "hole bucket" into "non-hole bucket", put hydroton into top bucket and fill with your r/o water etc.
4. Swish and move hydroton then LIFT the top bucket up and let the water drain into the bottom bucket
5. Discard the "dirty water" and repeat until your hydroton is "clean"
6. Transfer hydroton to "non-hole bucket" and fill with r/o water and add KLN or fertilizer overnight prior to use.
yw