I'm building a new off-grid house. I have a septic tank exclusively for WC's, but the bathroom has its own independent stone & gravel soak away which is straight into the ground and not connected to the septic, and obviously not connected to any main drains etc. Therefore, no sewer gases etc. Which makes me think - in this specific case do the bathroom fittings (sink, shower, and bath) even need traps??
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