The 3.5 Submersible Borehole Pump category of SRMPUMP fills a key gap between smaller 3” and larger 4” models, designed for deep-medium boreholes (150 to 250 feet) that require higher flow rates than 3” pumps but can’t accommodate 4” units. This makes it an ideal choice for growing households (with 4+ family members) and small-to-medium commercial operations (like a local gym or 10-room motel). SRMPUMP’s 3.5” model delivers a flow rate of 25-40 GPM—enough to supply multiple high-demand appliances (e.g., washing machines, dishwashers) simultaneously without pressure drops. For commercial users, such as a small motel, this pump ensures consistent water flow to all guest rooms, even during peak hours (e.g., evening showers). A key feature of this pump is its dual-impeller design, which boosts lift capacity (up to 250 feet) while maintaining energy efficiency—our tests show it uses 10% less electricity than competing 3.5” models. It also includes a built-in check valve to prevent water backflow, which protects the motor from damage and reduces wear on internal components. The pump’s casing is made of duplex stainless steel, which offers superior resistance to saltwater and acidic well water—making it suitable for coastal areas where groundwater is often corrosive. The category includes a “Flow Rate Calculator” to help users determine if this pump meets their needs (e.g., a 4-person home needs 30 GPM) and a “Troubleshooting Guide” for common issues (like low flow, which may indicate a clogged filter). We also offer a 5-year warranty on the motor—longer than many competitors—giving users peace of mind. Whether you’re a homeowner with a growing family or a small business owner needing reliable water supply, SRMPUMP’s 3.5 Submersible Borehole Pump category delivers the perfect balance of size, flow, and durability.