I do that with my dish soap bottles also. Usually once will finish it off.Several years ago, I tried to grow tomatoes inside my green house with the idea of having tomatoes late into fall, because the plants would be protected from freezing. I wanted to grow them in a big tote, so they'd have plenty of root room.
I didn't want to drill holes in the totes, so that I wouldn't ruin them. But... drainage... Hmmm. I put a couple inches of rocks in the bottom, then filled it with (homemade) potting soil. The tomato plants did diddly squat (probably because it got REALLY hot in there), so the experiment didn't work. But I had two totes full of nice potting soil. With lots of rocks in the bottom.
I've used the soil for starting tomatoes and other tender plants in the spring. Yesterday, I planted 5 pots each of kale and spinach. Today, I planted 6 pots of mixed lettuces. I am getting to the bottom of the tote, and getting lots of rocks. That slows the planting process down.
I didn't have much soil in the tote, so I dumped it into a bucket. I shook the bucket, banging it on the ground.
Some rocks came up to the surface. Picked them out. Banged it on the ground, more rocks came up.
OMG!!!! ROCKS FLOAT!!!![]()
Finally, I was scooping out less than half a trowel's worth of dirt, picking rocks out of each scoop. But there is still some nice potting soil in there. I'm going to find something to sift out the rest of the pebbles. I am hard core about not throwing out something that I worked hard to make.
Ok, you want to know how hard core, ie, cheap I am? This is what I do with shampoo.
https://www.backyardchickens.com/th...tips-and-tricks.1559066/page-83#post-27275631