Quality Hydroseeders Sales - TurfMaker Positive Displacement Pump TurfMaker Pumps can pump thick slurry materials through long hoses. This is important when your job calls for Flexterra® or other highly effective erosion control mulch. Centrifugal pumps do not have this pumping characteristic.The base TurfMaker® 325 will mix and pump any mulch product (including Flexterra®) up to 100 pounds per tank load and pump that slurry through at least 300 feet of hose normal mulch 400 feet of hose with a 10 HP engine most hydromulchers sell with a 14-51 HP engine.