Coke Can?

this is what i did for my 20gal pots an aeration level with hydrotons covered with used coco mulch disks and filled in the rest.
 

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The sponge trick actually works. I don’t do this for my weed plants but for my hanging houseplants that get thirsty rather quickly putting cut up old sponges in the bottom of the containers retains moisture better than nothing at all. I also put those dome thingys under the hanging pots so we don’t get the carpet wet from overflow when watering. A root riot plug or rockwool cube does much the same thing.
For cannabis I would just add perlite and/or vermiculite to the soil mix as needed to increase air to the roots or for moisture retention. Any compost you add like ewc usually needs some perlite added in to help keep it from being too clumpy. Vermiculite is good for keeping the soil from compacting and stays wet long after watering.
 
Good watering practices ensure that your plants have healthy amounts of oxygen. Proper procedure is more important than trying special tricks.
 
Hey just because I asked don't mean I'm having problems. I was just asking.

Actually I'm using Happy Frog and feeding every third watering and so far no problem.

Good to ask questions, I didn't mean to seem like I was dismissing your experiment. I would keep in mind when you put things in the soil including clay rocks (hydroton) etc you are reducing the actual rootzone capacity of your pot (roots can't grow through rocks etc). If you want the most oxygen possible make sure your not over watering and try increasing how often you water/fertigate.
 
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