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I have never had a canister filter before so I am at a loss to fix my problem. The filter has been running smoothly for 6 weeks. Then the water intake stopped - no suction. The filter itself continued to run - just no suction, no water coming into the intake tube. Several actions could start the suction again (although very slowly) - turning the intake valve off/on, turning the filter off/on, opening/closing the priming cap. The water would flow for an hour or two, then stop. I have taken the filter apart three times, cleaned everything, found no obstruction. The filter is sitting under the tank, on a standard cabinet I bought the the aquarium shop. Help!

is there any air getting into the filter and breaking suction? if not id take back the filter and get it replaced.

OH TOLEEDY!

This definitely sounds like an air infiltration problem. The unit was formerly known as a Via Aqua 650 cannister filter. Replacement parts may be found at http://www.commodityaxis.com/productdata.aspx?id=48.

I would:
1. Replace intake hose,
2. Check seal at intake flow control valve,
3. Replace large and small "O" rings in the unit,
4. Check pump head rubber gasket.

__________
"To steal ideas from one person is plagiarism; to steal from many is research."
researched from Steven Wright

if its under warranty dont spend any money on spare parts, return it

OH TOLEEDY!