Pressurized filtration is the method of pulling water from the pond by the means of a pump and pumping the water to a filter. In most cases the water is pumped directly from the pond to some type of pressurized filter.
Pros:
Allows for more water turn over with less equipment. Allows for more compact filtration units.
Cons:
Fish waste and debris pumped from the pond to the filter get purred into thousands of tiny particles. The filtration has a much harder time removing these particles. The filter also has much less contact time to properly remove the ammonia, nitrite, and nitrate from your pond.
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