Products > Strainers

The LPD-Mag is the lowest pressure drop Y strainer on the market, upgraded with a magnet to catch iron oxides.

Introducing the LPD-Mag from The Metraflex Company—the lowest pressure drop Y-Strainer on the market, upgraded with a Neodymium magnet to catch iron oxides. The LPD-Mag is the industry’s first strainer solution to pump seal failures caused by iron oxide build-up within the water system.

This large accumulation of iron oxides is known as “sludge”. Overtime, sludge can work its way into even the smallest openings in your system, clogging and slowing down system performance and efficiency. This leads to seal failures in pumps, damaged boilers, chillers and heat exchangers.

How it Works

In Service Blow-Down Procedure
seal and magnet

Accumulation of Sludge in an ECM Pump vs
Accumulation of Sludge Trapped and Removed by LPD-Mag During Testing

Product Tests Conducted at
Milwaukee School of Engineering

The Neodymium rare-earth magnet installed within the strainer assists in the removal of iron oxide buildup, helping to assure your system runs smoothly. The magnet is installed into the collection vortex of the LPD, maximizing the magnet’s ability to catch iron oxide.


The magnets are constantly collecting magnetic debris while at the same time larger foreign materials are being captured in the perforated stainless steel screen.
To ensure all the particles captured are blown out during the blow down process, slowly draw the magnet(s) out of the drywell and stop when you see the red line.
Open the valve and blow down for 3 to 5 seconds and at the same time pull the magnet the rest of the way out. Then shut the blow down valve. Re-insert the magnet.
The Original LPD-Y Strainer

The Low Pressure Drop Y-Strainer was the result of Metraflex completely re-engineering the traditional Y-strainer to provide a strainer with a much better pressure drop and at the same time a much higher debris capacity than any Y-Strainer or basket strainer on the market.  People that were looking for lower pressure drop efficacies have also been using pumps with ECM motors. These motors are a big improvement over the traditional electric motors.  However, it turns out that using the ECM motors had an unintended consequence.  the larger, very powerful magnets drew the iron oxide into the seal area of the pump causing seal failures.  These users came to Metraflex for a way to remove the iron oxide from the water, and the LPD-Mag was created.