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Fortunately I’ve not had any blocked drain issues, the nearest thing was I’d get home after Joey had enjoyed a long soak in a bubble bath, to find a wide river of foam along the front path halfway to the gate! Partly because it just sat on top of the grate in the drain, which was set about a foot below the path, and partly because dry leaves would blow down the street and collect in the drain.
I’ve stopped the leaf issue by putting a small paving slab over the surround, after I startled a hedgehog and it tried to nosedive down the drain…
I did have an issue with the bathroom sink overflow not working, and smelling a bit off, through decades of soap from the soap dish and other detritus collecting down there, along with it being a hard water area. I discovered that pouring a capful of kettle descaler down there, was very quickly followed by an eruption of dirty dark grey froth out of the overflow and straight down the plug hole!
A couple of capfuls cleared it very successfully. 😁
Dad always gets caustic soda out for unblocking drains. Can't be good but it works.
all the grey water from bathroom and kitchen goes into an ‘open’ drain outside with a grill over, so that stuff that doesn’t clog the pipe then gets caught on that grill rather than disappear into the sewers.
Known as a grease trap, a basic sedimentation system used on old fashioned sepctic systems. You're supposed to get it cleaned annually ... ours was a right pain as tree roots love it cause it to block and the greywater backs up.
Fortunately we've got a new treatment plant installed that processes all grey and black water in our garden and irrigates with the treated water. It's a thing of beauty... assuming we don't get extended power cuts!