Status update: my original device has been working fine for over a year now in my planted tank. I've refilled the nutes twice when it got to be about half empty. I've been taking effortless growth for granted now, occasional pruning, CO2/nute refills or bulb replacement is all they need to keep things churning along.
Considering the device cost a jar and $3 of tubing, I couldn't be happier with it.
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