Connect the barrel to the downspout. Using a stainless-steel hose clamp, secure the aerator to the end of the tubing coming out of the barrel. Once the barrel is full of rainwater, run the aerator for at least 24 hours. (If using tap water, aerate for 20 minutes before adding compost.) Leave the aerator on whenever there's tea in the barrel, to keep the bacteria alive.
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Drill (or drill/driver)
⅜-inch spade bit
3/16 drill bit
Pump sprayer (for applying the compost tea)