I believe it is a safety measure in case a LECA bead moves and covers one hole, there is still a second one as a backup. If you don't have many plants in S/H it probably isn't an issue, but people with a lot of plants and have watering automated could find themselves with drowned plants!
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Originally Posted by orangehero
Excuse me to resurrect this, but I have a quick question that isn't really explained explicitly in the guides I've been reading:
Why are people making two holes in their containers? As I understand the reason for the holes is just to drain all of the liquid above a certain level to create a reservoir of liquid. So wouldn't that require just one drain hole to accomplish?
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