Atlantic Water Gardens TUP2000 Pool Cleanout Pump Yellow Pine Muck can be a source

Muck can be a source of odors

ALSO consider adding Automatic cleaning cycles to the Nexus220 or Nexus 320 with this link

Matala Geyser Max-Flow Pumps are excellent

Includes tubing strain relief and fittings to connect to different sized air tubing

Atlantic Water Gardens TUP2000 Pool Cleanout Pump Yellow Pine Muck can be a sourceThe TUP2000 is a heavy duty continuous duty cleaning pump that holds protection from running dry, overheating, and corrosion. It fits into most swimming pool drains to effectively run the pool dry. Includes backwash hose adapter fitting, heavy duty top handle, and strain relief to protect cord. 316 stainless steel and composite construction resists chlorine, salt and acid Shallow water bottom intake drains water down to 1 2" depth Flow through