Laguna Pressure-flo 4000 Filter with 36 Watts UV – 4000 Gallons – PT1728

Original price was: $554.99.Current price is: $471.74.

Model Name – Laguna Pressure-Flo 4000 with 36 Watt UVC
Model Number – PT1728
MAX Pond Size Low Load of fish in shade – 4000 Gal
MAX Pond Size High Load of Fish in Direct Sunlight – 2000 Gal
UVC – 36 Watts
Biological Media – 4800g of Bio-Lava Rock
Dimensions MAX (W X H) – 14.3″ X 25.2″
Inlet/ Outlets – 3/4″ – 1″ – 1 1/4″
Recommended Max Waterfall Height to Achieve Above Performance – 39″
Recomended Flow Rate – 2400 G.P.H.
Cord Length – 16′
Warranty – 3 Year
Shipping – FREE

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The new and improved Laguna Pressure-Flo pressurized pond filter eliminates green water and kills algae. The Laguna Pressure Flo provides mechanical filtration coupled with a powerful UVC sterilizer to produce a clear, clean and healthy pond environment for your pond. Simple to install and easy to maintain and clean, Laguna Pressure Flo filters are the heart that will keep your pond beautiful all season long.

The new Laguna Pressure Flo filters include a variety of improvements to simplify the maintenance process and provide more powerful filtration. Starting with the filter handles and diverter valve, each has been re-designed and strengthened. The cleaning handles now feature an ergonomically designed grip with re-enforced brush connections. The diverter valve has been re-shaped and enlarged to accommodate an improved cleaning indicator system and makes the patented Backwash Cleaning System easier to use. Yearly UV bulb maintenance has been simplified by improvements to UVC-Head; the screws used to attach the head to the filter unit are permanently connected to the UVC head. No more misplacing or losing screws during maintenance.
Along with physical improvements to the filter body, the new filters also include increased filtration capabilities. The mechanical filter pads are now 10X stronger than the current pad foams to better maintain their rigid shape and performance. The UV sterilization functionality has been increased with larger more powerful UV Bulbs. Biological filtration has been improved with the conversion to Bio-Lava rock filter media. The Bio-Lava rock provides increased surface areas which promotes the growth of healthy bacteria resulting in cleaner healthier water (Biological filtration not included in Pressure Flo 1000 model number PT1725).

The Pressure-Flo filters are designed to work in tandem with a solids handling pump, such as the Laguna Max-Flo Waterfall and filter pump. With the filter connected to the pump, water enters the unit through a water inlet. It then passes through the mechanical filtration stage, consisting of highly durable foam filters that intercept and trap dirt and debris.

Dirt-free water then passes along an integrated UV-C lamp, where it is exposed to ultraviolet rays that inhibit the growth of algae. Finally, water returns to the pond thoroughly cleansed. This patented system is the only one of its kind. Backwash cleaning can easily and comfortably be completed in a few minutes without opening the lid. This feature ensures that the filter performs at optimal levels for many days and prolongs the time between full maintenance sessions. An easy-to-view cleaning indicator signals when itfts time to perform backwash cleaning.

How to Test Pressure-flo UVC Power Supply

Additional information


Filtration Type

Filters Max Pond Size Range

Filter UV Option

With UV

Pond Product Type

Pond Filtration



Filter Max Pond Size

Parts and Accessories