Penn-Plax Undergravel Filter
3.1Aikins Score•Penn-Plax
The verdict
The Penn-Plax Undergravel Filter is a classic choice for those wanting biological filtration on a tight budget, but it's less efficient than other filter types.
Read the full reviewWhat we love
- +Inexpensive and simple design
- +Provides biological filtration through gravel bed
- +Low maintenance once established
Worth noting
- –Requires gravel substrate to function
- –Not as effective as modern HOB or canister filters
- –Difficult to clean thoroughly
How it scored
Aikins Score3.1
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At a glance
Filter TypeUndergravel
Tank SizeVaries by model
Aikins Score6.2 / 10
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