Blackwater Cool Season, 5 lb bag, Medium Pellet Beneficial Bacteria The pressure relief valve protects

The pressure relief valve protects the compressor from excessive  backpressure if there is some sort of blockage in the airline or diffuser

They are designed with a built in funnel and a powerful centrifugal air blower that delivers 1/8" to 1/4" floating fish pellets in a wedge shape feed patter that goes about 45 feet out into the pond and about 20 feet wide

Photo shows brown color

Defoamer instantly removes surface foam

Kit includes #EBD4 Bottom Drain

Blackwater Cool Season, 5 lb bag, Medium Pellet Beneficial Bacteria The pressure relief valve protectsThis terrific line of Blackwater Koi Pellets gives you the quality and variety of high end Koi Feeds at the price of a standard staple diet. All varieties come in a vacuum packed resealable zipper lock bag. Cool Season This is a highly digestible diet formulated for Koi and Goldfish when water temperatures are consistently below 60 degrees F.