Well, I am a very picky person when it comes to good drainage in a bucket. I don't like any chance of water not draining properly. I found that the way I'm gonna show you makes flushing easier and gives the roots plenty of room and oxygen. This is for those with room for this size bucket. but the theory will apply for 3 gallon buckets. I have yet to get rootbound during flower this size. 1. I take a 9/16 spade or forschner drill bit. (picture shows spade) I drill a butt load of holes around the bottom edge and sides. 2. I then take a layer of "well rinsed" river rocks. (garden shop 30 lb. bag 3 bucks). and fill it up to the top of the holes at the bottom. (about 1"-2") 3. Then I take my soil. (I use liquid fert. so the mix can vary for you organic growers). My mix is 2/3 potting soil (20 pound bag), 1/3 perlite/vermiculite (about 4-5 cups each) mix. 2 tbs. of Lime. Well blended. 4. Then I water it down with a gallon of distilled water. I let it drain for a few hours. This helps the dirt settle, Add more soil as needed. I always loose 3-4 inches by settling. I don't add anymore dirt until after I transplant. When I flush it is much quicker and the roots have tons of room and air this way. IMHO. Total wieght before plant. 30+/- pounds. Its heavy.