I've done it twice myself. I forgot to turn off the sink while it was filling with water, and when I came back to my bathroom, there was water everywhere. At least I made my ATO water
I may have told this story here before. A similar flood is part of why the BeanAnimal Overflow was born. It was not an overflow clog that started the idea, but a major RO/DI flood that put me in the position of being homeless if another flood of any kind happened.
Of course, 20+ years later there have still been numerous “oops, the RO/DI” type floods....
The most embarrassing part of the first one went like this.
I had just set up the tank, joined the local reef club, and attended a meeting or two. I volunteered to help a long-time member move his tanks. A 500, a 220, and a 130 or something like that. The whole club was at his house and I was the new guy.
My Motrola flip phone rings.
The Warden: “There is water on the basement floor. Something is leaking.”
Me: “How much and where is it coming from?”
The Warden: “Your fish room. A lot.”
Me: “How much is a lot?”
The Warden: “I stepped off the bottom step in my socks and my feet are ** sopping wet. Does that answer your dumb ** question?”
Me: “Umm… so… umm…”
The Warden: “Tell me what to **ing do. There is water everywhere.”
Now I am standing there red-faced because everyone in the room can hear the Warden yelling about wet socks and water -- loud enough to turn the flip phone into a conference room speaker.
Me: “Okay… umm… just pull the main plug to the left of the door.”
The Warden: “That made it 10× ** worse. Now the whole sump thingy is overflowing everywhere. Now what?”
Before I could respond, the homeowner and a few club members said, “You better go. She sounds very mad.”
Upon arriving home I found that I had left the house and forgotten to turn off the RO/DI that was filling the sump for evaporation makeup. No ATO yet. Over the hours we were both gone, it overflowed the sump and flooded the basement. When she pulled the plug, the backflow -- maybe another 3–5 gallons -- made it even worse.
When I returned to the tank move a few hours later and explained what happened, expecting to be laughed at, the tank owner’s wife said:
“Don’t feel bad. Ask this idiot how many times he has flooded our basement and what it cost us to fix it.”
She then held court for the group and explained two RO/DI floods that required professional cleanup, including industrial fans, carpet and drywall replacement, mold remediation, etc. Then several other members told their own stories.
I felt better. The Warden did not.
To this day the club member and his wife still our good friends. Every once in a while when we get together she will say, “Hey, did he happen to tell you what happened last week? He fell asleep with the RO/DI on” and he gives me the look that says: please do not respond, it's bad".
Now, back to your regularly scheduled programming...