Underwater Filter
Do I need a Pond Filter for an understocked fish pond?

I have 5 Small (4inch) Comet Goldfish in a 350Gal Pond. I have strong a water pump, about 7 large Water Hyacinth and a good amount of underwater oxygenators. I recently added an ammonia & nitrate eating bacteria solution to the water.

Will I still need a Bio Filter to keep the pond healthy?

You'll need some sort of a filter to filter out the sludge and algae that will form. Bacteria is awesome for your pond.
You can build your own biofilter using a rubbermaid container, some tubing and lava rock - just be sure you rinse the lava rock good before using it the first time.

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Aquarium Submersible Biological Filter Pump 119GPH NEW
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FLUVAL U U1 INTERNAL AQUARIUM FILTER UNDERWATER 15 GAL
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FLUVAL U U2 INTERNAL AQUARIUM FILTER UNDERWATER 30 GAL
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FLUVAL U U3 INTERNAL AQUARIUM FILTER UNDERWATER 40 GAL
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FLUVAL U U4 INTERNAL AQUARIUM FILTER UNDERWATER 65 GAL
FLUVAL U U4 INTERNAL AQUARIUM FILTER UNDERWATER 65 GAL
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FLUVAL U Series (U1, U2, U3, U4) Underwater Filters