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Its underground.i've had a good look and think I will be able to squeeze between 20/25mm a mtr.if the max is only 6mtrs is there anyway to get round it like maybe putting in a inspection chamber halfway so it will run 6mtrs to chamber then to man hole

What if I can't get that much drop over that distance.whats the least I could get away with per mtr

Thanks Ken.ive only got 1 wc and a hand basin on the run so 12.5mm should be fine even though it's a 13mtr run ?

I'm putting a toilet under the stairs.the run of soile pipe is 13mtrs.whats the correct fall per mtr( min/max) thanks