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RainStorm13 t1_iy0b3g2 wrote

If so, the issue may just be the low flow toilets these days. When the cast iron drains were installed, toilets were 3+ gallons per flush. So there was a lot more water per flush. Are your toilets low flow? Modern toilets are limited by law up to 1.6 gallons per flush.

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Rolling_on_the_river t1_iy0gjuy wrote

I am unsure of this, I am outside of the US. It's clear when there is a blockage that the flow of the flush is worse.

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RainStorm13 t1_iy0gpu4 wrote

Correct. When there is a blockage, the toilet will not flush correctly.

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Rolling_on_the_river t1_iy2boa1 wrote

I have reasons to believe the problem lies elsewhere.

In my house I have this pipe that's connected to the system. This pipe is capped with some sort of de-pressuriser. This sometimes smells like sewage. Could this be the culprit?

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