i've notices some black hard bits (look like gravel but smaller) in my tub
these couple of days and i think they come out of the shower. i'm worried
there are leaks on the sewer drain pipe and on clean water pipe (that i use
water from it to have shower) and the waste from sewer drain water can get
into the clean water pipe and make the shower water contaminated. do you think
that possible? I'm really worried because i have a 1.5 year old baby in the
house and there are lots of harmful viruses and bacterias in sewage !

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