Agitator unlocks waste from media saving the amount of water discharged during backwash and rinse cycles Unique, patent pending 3-way master valve locks into run, rinse, and backwash settings Clear-vue inspection port to monitor water clarity during backwash/rinse operation Positive pressure lock ring to ensure a tight water seal Reusable Bio-Matrix Media affords maximum surface area for beneficial bacteria growth Heavy duty poly canister can be buried for hidden installation Optional field-installed bottom drain available (not included) Can be easily operated using a single energy-efficient magnetic-drive or similar pump, (not included) Does not require a high-pressure pump to back wash, This model does not have the uv Sterilizer, SKU: RPS24344