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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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