16. As an alternative to a submersible pump the wall of chamber 3 can be drilled with a standard
hole-saw bit to accommodate a bulkhead fi tting (not included) for use with an external
pump. A 1" bulkhead requires a 1 ¾" hole-saw bit. OBSERVE ALL APPLICABLE SAFETY
PRECAUTIONS WHEN WORKING WITH POWER TOOLS. IF UNSURE, CONSULT A TRAINED
PROFESSIONAL. CENTRAL AQUATICS WILL NOT HONOR WARRANTY AS A RESULT OF
DAMAGE CAUSED BY IMPROPER DRILLING.
Suggested pumps for external use
CORALIFE
TURBO SEA
EXTERNAL PUMP
580-P
790-P
1100-P/1090
1740-P/1270
Because these sumps can be used on aquariums with multiple footprints and plumbing
arrangements the following steps are necessary to determine the maximum safe water
level in the sump.
1. Prior to fi lling sump with water check to make sure all hose connections are tight and secure.
2. Fill chamber 1 with water so that it overfl ows and begins to fi ll chambers 2 and 3. Continue
until the water level in chamber 3 is approximately 1-2" above the top of the pump.
3. Fill aquarium with water until water just begins to fl ow through the overfl ow box. If using
a hang on type overfl ow box the siphon connecting the inner and outer boxes will need
to be primed at this time.
4. Turn on return pump and fi ll system with additional water until water level in chamber 3
is running steady 1-2" above the top of the pump.
5. Mark the water level in chamber 3 with a piece of masking tape or marker.
6. Turn off return pump and check that water does not siphon back into fi lter from return line.
If using a check valve no water should drain back through pump. If using a siphon break the
return should begin sucking air immediately and stop siphoning water in 1-2 minutes.
7. Wait 15 minutes to be sure water movement has completely ceased.
8. Mark the water level in the sump with a piece of tape or marker. If the sump overfl owed,
the sump is either too small for the size of the aquarium or the anti-siphon device on the return
did not work properly.
9. Measure the distance between the two marks and add 1 inch.
10. Measure the calculated distance down from the top of the shortest wall in chamber 3 and
mark with the Maximum Water Level sticker. This is the maximum fi ll level of the sump.
The operating water level can be any level between this line and the top of the pump. When
operating, the sump should never be fi lled above this maximum water level mark to prevent
overfl ows during power outages.
PROFLEX
PROFLEX
MODEL 1
MODEL 2
x
x
x
Filling Instructions
PROFLEX
PROFLEX
MODEL 3
MODEL 4
x
x
x
x
10