PuriFalls® PF14P Our smallest PuriFalls® named for the 14" width opening. Ideal for pumps up to 2,000 gph. Like all of our PuriFalls® waterfall biological filter boxes, the PF14 has many uses - creates a beautiful waterfall, oxygenates the water, use as a stream starter or to improve pond filtration to handle more fish or help improve pond water clarity. Extremely rugged, built from high-density polyethylene, hence the P suffix on the product name. Designed and manufactured specifically for ground burial which disguises the box and hides the plumbing lines that feed this filter. Because of the seam running through the back of the box, the hole for the included 2" bulkhead fitting is pre-drilled on the right hand side of the box as you look at the waterfall from the front.