Any solids that don’t float will sink to your “V” bottom from the DAF tank. Settled solids are concentrated and discharged by an instantly controlled pneumatic drain valve. HydroFlo Tech manufactures complete dissolved air flotation (DAF) methods with recycle/air diffusion technique including recycle pump, air saturation vessel and relevant controls. http://emilianoreoay.jaiblogs.com/6873207/considerations-to-know-about-air-flotation-units