Growpito vs Mapito

Iv started bottom feeding, few times now. They look great however I have to water often. I was expecting the growpito to hold water volume to keep feeding a smaller plant longer…

Then it dawned on me. In saucers the 2 gallon containers drain holes come up pretty much to the saucers limits. The drain holes weren’t fully submerged… following?

So the vacuum, or capillary action of the medium was being interrupted by the lack of water volume… kinda like pulling a hose partially out during a siphon.

I’m correct in my assumptions how this works? Makes sense to me but I’m no physicist…

Also, iirc the growpito really can’t be overwateted? So no real danger if I leave pots in saucers to get a good soak?.. they did get pretty dry.

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