I'm interested in hard piping the sprinkler system drain down pipe into the 6" sewer via a closed system.
My inspector can't tell me why I can't and says I need to build a 4" stand pipe with a wet trap. This will use a lot of water throughout the years just to keep the trap wet and will only be used once a year.
Why can't I hard pipe the drain into waste and avoid the air gap with a wet trap?
I would welcome any comments from anyone.
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