(b) The baffle trap must be properly maintained to prevent clogging of
the soakage pit. The grease retained in the trap should be skimmed daily from the
surface of the water or as often as required. It is either buried or burned. The entire trap
should be emptied and thoroughly scrubbed with hot, soapy water as often as
Figure 2-5. Baffle grease traps: (A) barrel type (B) box type.
(2) Barrel filter crease trap. The barrel filter grease trap (see figure 2-6) may
be made from a 30-to 55-gallon barrel or drum which has had its top removed and a
number of large holes bored into the bottom. Eight inches of gravel or small stones are
placed in the bottom and covered with 12 to 18 inches of wood ashes or sand. A piece
of burlap is fastened to the top of the barrel to serve as a coarse strainer. The trap may
be placed on a platform with a trough leading to a soakage pit or placed directly over a
soakage pit. If it is placed directly over the pit, the bottom may be removed instead of
having holes bored in it. Every two days, the grease trap should be emptied, washed,
and refilled with fresh ashes or sand. The old ashes or sand should be buried. The
burlap filter should be either washed or replaced every day.