Except for the first time installation or when the intake pipe had to be removed out of water for some reason, the siphon is still there so no need for sucking the output hose. And you don't need to remove the intake pipe when cleaning the filter. Here's what I do step-by-step when cleaning one of my 5 classic's:
1. Turn off the power
2. Switch off the double tap connectors on both intake and output (4 switches total)
3. Disconnect the hoses and remove the canister
4. Drain water from the canister to a 5g bucket, dump the media into it and give it a good clean
(Note: don't try to open or close the lid when all the valves are close)
5. Clean the impeller housing if needed
6. Put the media back and close the canister lid (remember to have the valves on the hoses open or you won't have a tight close)
Priming:
1. First time (or when siphon is lost):
a. Install all hoses per instructions with all valves on double-tab open
b. With the outlet connector not attached and the inlet attached, suck on the outlet
c. Quickly attach the outlet connector (you'll have about 5-7 seconds to do this)
d. Wait for water to fill the canister fully, and optionally give it a shake to purge any air from the canister, plug in the power
or
2. After cleaning with inlet siphon still remained:
a. Drain water from the output hose (simply lift it out of the tank water, open its valve at the double-tab and catch the water with a cup)
b. Put the outlet pipe back in the tank and connect the double-tabs on both inlet and outlet
c. With the outlet valve open, now open up the inlet valve. The siphon should kick in and fill the canister with water.
d. Same as 1.d above
The process may seem long with my step-by-step instructions above, but it's very simple on the second time onward. I can get one cleaned in 10 minutes if the media is not very dirty.
Don't use the spray bar if you prefer a little more current from the output.
And most if not all canister filters will auto-restart after a power outage so no worries there.
1. Turn off the power
2. Switch off the double tap connectors on both intake and output (4 switches total)
3. Disconnect the hoses and remove the canister
4. Drain water from the canister to a 5g bucket, dump the media into it and give it a good clean
(Note: don't try to open or close the lid when all the valves are close)
5. Clean the impeller housing if needed
6. Put the media back and close the canister lid (remember to have the valves on the hoses open or you won't have a tight close)
Priming:
1. First time (or when siphon is lost):
a. Install all hoses per instructions with all valves on double-tab open
b. With the outlet connector not attached and the inlet attached, suck on the outlet
c. Quickly attach the outlet connector (you'll have about 5-7 seconds to do this)
d. Wait for water to fill the canister fully, and optionally give it a shake to purge any air from the canister, plug in the power
or
2. After cleaning with inlet siphon still remained:
a. Drain water from the output hose (simply lift it out of the tank water, open its valve at the double-tab and catch the water with a cup)
b. Put the outlet pipe back in the tank and connect the double-tabs on both inlet and outlet
c. With the outlet valve open, now open up the inlet valve. The siphon should kick in and fill the canister with water.
d. Same as 1.d above
The process may seem long with my step-by-step instructions above, but it's very simple on the second time onward. I can get one cleaned in 10 minutes if the media is not very dirty.
Don't use the spray bar if you prefer a little more current from the output.
And most if not all canister filters will auto-restart after a power outage so no worries there.