There has to be more to it than that. A 7 minute shower puts 15 gallons of water down the drain. Was this a second shower that didn't get used except as a urinal?
No. The other bathroom in the house is a tub only, no shower.
I don't know the chemistry behind it save I've done more than one job where I've seen that type of mess. I only do plumbing work for people I know, if I wanted to do it professionally I wouldn't have gone into electronics where I can sit in an air conditioned office all day and play with blinkenlites.
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