I use plastic bins under my fabric pots and use wet dry vac for runoff I grow in a closet w carpet so don’t want to drench carpet mold will eventually appear
I use 7 gallon fabric pots and when wet they’re pretty heavy. I don’t use Nets, I do spread and pull my plants out for better light penetration. as mentioned some people use Shop-Vac to pull out the excess water.
To help keep my water in the bag, I start with 1-2 liter for each plant. Water in a circle and give it 5 min. The water will trickle down and the dirt will lose its repelling power as the neg ions engage with the water. After 5 min you can give it a good gallon or whatever you need slowly and it should soak down without running out the sides. I would also elevate them on a rack with plastic bin lids to catch the overflow. You will need them for sure if you plan to flush the soil ever.
Well Thank you TokerGuy I decided to put my 5 gal fabric bags on a one of those wire shevles you buy at Home Depot I had in the basement. I have Tupperware totes like the ones you put under your bed I have three in the bottom of the tent and the wire rack fits across so I can have three bags across. So when I water or feed it goes thru the soil then, drips down into the trays which I can wet vac up and then I can use that outside on the big grower in the box. I saw someone out here using a rack.