Above on left view the Starboard Arid Bilge System Series 9 unit which draws bilge liquids from nine compartments, four of which contain machinery that could produce oil leaks. The discharge is then run through the Eco Friendly Discharge Companion to the right. Next, the bilge liquids drain into a Rule Sump (not shown) which is always powered on. The Rule Sump discharges through the Mycelx Cartridges shown in the picture below. 

The Port aft compartment in this catamaran installation contains a second Series 9 unit (not shown), which discharges into a second Eco Friendly Discharge Companion (shown below), where the bulk of the bilge oil is captured. 

This Eco Friendly Discharge Companion also drains to a Rule Sump shown below on right. This Rule Sump is always powered on and pumps liquids through two additional Mycelx cartridges shown in yellow below. 

The discharge from both sets of Mycelx cartridges enters the manifold at upper right and left. The center top port is a vent. The liquids travel down through this manifold and out the 1/2" barbed port at the bottom.

Next, the full flow from both units passes from the manifold through the OMD-21 Oil Monitoring Device, entering at the bottom and flowing out at the top right.

Next, the full flow passes through a vented loop. The height of the vented loop must be sufficiently high enough to keep the Oil Monitoring Device flooded at all times, and low enough to allow minimal spillage of water when the cleaning cap is removed.

Next, the liquids flow into a third Rule sump, which takes the place of a Y valve in most installations.

A fail safe relay in the alarm box shown below is energized by the Oil Monitoring Device when the Monitor is powered on and not in the alarm state. A 24 volt piezo alarm sounds off, when the alarm state is entered and the cancel audio button is located above the piezo buzzer. If 15 PPM (parts per million) or above levels are reached in the discharge effluent,  the audio alarm sounds, and turns off the Rule sump causing it to overflow back into a single bilge compartment, in this case the Port generator room.

Next, the discharge effluent travels through a second vented loop. Note that all hoses used throughout the installation are the fire rated exhaust type and double clamped with stainless steel clamps at all hose connections. Finally, the discharge effluent travels through a bronze ball valve and thru hull fitting to exit the vessel.