The Collaborative International Dictionary of English v.0.48:

Sesspool \Sess"pool`\, n. [Prov. E. suss hogwash, soss a dirty
   mess, a puddle + E. pool a puddle; cf. Gael. ses a coarse
   mess.]
   Same as Cesspool.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cesspool \Cess"pool`\ (-p[=oo]l`), n. [See Sesspol.]
   A cistern in the course, or the termination, of a drain, to
   collect sedimentary or superfluous matter; a privy vault; any
   receptacle of filth. [Written also sesspool.]
   [1913 Webster]