Comment by martey

This is covered in the post (emphasis mine):

> With similar concerns in mind, we also decided to limit the tank size to 20 gallons, as the grow-bed above also contains an additional ~10 gallons of water. Since a gallon of fresh water weighs roughly 8.34lbs, we estimate this puts the entire weight of the system’s water somewhere between 170 and 250lbs. Considering the weight threshold of the industrial shelving, and given that we live on a high floor in our building, we decided to constrain the system to this size to minimize the flooding risk.