Jon wrote:
What is silica sand used for? I have 4 25kg bags that were left at my house
by the previous owners.

wrote in message
ups.com...

what does rock salt do to a septic? i have city sewer but use salt to
stop root growth in a bad line with roots





Rock salt is NOT good for septic tanks, high salt levels damage the
bacteria that process the wastes in the tank. This is one reason why
many communities prohibit water softener wastes from septic tanks, and
the mineral heavy effluent from RO systems is similarly banned.