one more to add to the list,sand pebbles from home deep', like a 80 lb bag for a couple of bucks,one rinse and thats it,i just changed out,went to rinse the pebbles,it was crystal clear,they are a little heavier than grow rock but i only use 6inch net pots so not an issue,one bag of pebbles goes a long way in net pots,there are some small stones in it,but they cant get thru the netpots,i i also bought a mesh wastebasket from the dollar store,its made of 1/2 in mesh,throw the rock in it and rinse,anything smaller than a 1/2 in goes thru the mesh and bobs your uncle! about 5gal bucket of rock in minutes, also i use dyna gro, never a nute issue or slime,no need to adjust ph,and contains all the nutes complete,clean,and easy,my plants love it,almost as much as i do, remember to keep it simple,your plants will love it and so will you!