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Hi, those pockets made sure that the water that went into the grilles could flow up and over into the overflow. Without those pockets who knows what direction water would flow, in or out of the overflow.
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-dennis
Elos Diamond 120xl | Elos Stand | Radion G4 Pros | GHL Profilux Controller | LifeReef Skimmer | LifeReef Sump
Photos taken with a Nikon D750 or Leica M.
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