I believe that my shower was installed without a P-trap and drains straight into the septic tank. I’m not in a financial position to install one at the moment, and was wondering if there was anything to do in the short term to stop smells coming up through the shower drain.
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You can use a trap seal if it truly is your shower drain…like this: https://www.supplyhouse.com/SureSeal-97041-2-SureSeal-Inline-Floor-Drain-Trap-Seal-SS2009V?gclid=CjwKCAjwmK6IBhBqEiwAocMc8gzciNc7I32zaL2_pWv6zkHb62_FiHNeQcWD-YpX76YOUTzwNcdTghoC1CgQAvD_BwE
More likely though, the smell is coming from the base of your toilet, where the wax ring has lost it’s seal. Next time you get a heavy rain and the smell is there, sniff around the bolts at the base of the toilet to make sure that’s not the source of your problem.