OceanFlyer Grand Banks 49' Classic Operating Manual page 64

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Bypass handle
However if you do need to change the fi lter:
1. Turn off the fresh water pump.
2. Drain the system by opening the sink faucets in the galley and
engine room.
3. Remove the safety tie-wrap on the yellow lever and move the lever
while holding the fi lter body.
4. Remove the fi lter and replace with a new one.
5. Close the faucets.
6. Turn on the fresh water pump.
Bypass the Fresh Water Filter
If for some reason you need to bypass the fresh water fi lter, proceed with
the steps above to de-pressurize the system.
Remove the fi lter and replace it with the bypass handle handing next to
the unit.
Th en close the faucets and turn on the fresh water pump.
Ultraviolet Fresh Water Filter
All water coming from the fresh water tanks is treated by an ultraviolet
light that kills 99.99% of bacteria and viruses.
Th e system is automatic and requires no service.
4K7: Waste Water
Waste water from the sinks and shower (but not from the toilets) is
dumped overboard in accordance with U.S. and Canadian law. Since
the bottom of the head compartment and engine room sinks and the
fl oor of the showers are close to or below the water line, a built in sump
pump operates to lift this water back above the waterline and dump it
overboard.
It is therefore very important that the "sump pump" breakers in the DC
panel be left "On", and that the switch in the shower stall labeled "drain
pump" also be "on" (pulled out) .

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