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RE: [APD] Re: replacing existing gravel
> Used up HCL will not be very corrosive. I just flush it down
> the toilet. The sewage system is designed to handle acidic
> content. My place uses ceramic pipes but all new houses have
> plastic pipes. Cement pipes will get eroded by acid.
Isn't sewage very basic instead of acidic? Equally corrosive, mind you,
but not acidic.
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