A tub in a basement apartment is occasionally getting suds from the tub of the apartment directly above. We also had suds coming up in a basement floor drain near the laundry area. A plumber checked out the basement drain with a television type scope and all looked clear. He concluded that the person using the washing machine was probably apt to purchase the soap which tends to froth more than most. The person using the washing machine near the foamy floor drain was indeed the same occupant of the apartment above the basement tub problem. Before paying to have that line scoped as well, can anyone suggest detergents (laundry, bath soap, or body wash products) which we could experiment with to see if the problem goes away with a simple switch? Does this occurrence jibe with anyone else's experience?

the apartment in the basement is in a plumbing "Suds Pressure Zone"

'google it'

the only options are:

1 - replumb allowing for said zone

or

2 - have the upstairs use detergent for HE machines

or

live with the issue as there is nothing wrong with the original plumbing except that the alteration did NOT allow for a newly created suds pressure zone


the areas marked with the arrows (10 X dia and 40 x dia) are the zones, dia = nominal pipe size)



drains should NOT be connected within said zones

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638



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