BWT R1 Backwash Filter 1-1/4" RSF LF | Lead-Free Whole House Filter

Part Number: 125596640

Product Overview

The BWT R1 Backwash Filter 1-1/4" RSF LF is a high-flow, lead-free whole house water filter designed to protect residential plumbing systems and water-using appliances from sediment such as rust, sand, and debris. Installed at the main water inlet after the water meter, it helps prevent dripping faucets, clogged valves, and premature appliance wear caused by foreign particles.

This RSF (backwash filter) model uses BWT’s proven 2-phase backwash technology for particularly intensive cleaning. Instead of frequent cartridge replacements, the filter is maintained through manual backwashing, recommended every 6 months. This version is supplied without a pressure reducer for systems where pressure regulation is handled elsewhere.

Features & Benefits

• ✅ Lead-free (LF) construction for potable water applications
• ✅ High-flow whole house sediment protection
• ✅ 2-phase backwash technology for intensive, hygienic cleaning
• ✅ Manual backwash maintenance—no disposable cartridges
• ✅ Helps prevent dripping taps and appliance malfunctions
• ✅ 1-1/4" (DN32) high-capacity connection
• ✅ Horizontal or vertical installation flexibility
• ✅ Quick installation via HydroModul
• ✅ 10-year warranty with product registration

Specifications

• Brand: BWT
• Series: R1
• Model: R1 RSF LF
• Type: Backwash filter (manual backwash)
• MPN / Part Number: 125596640
• Connection size: 1-1/4" (DN32)
• Filter mesh size: 90 µm
• Flow @ Δp = 0.2 bar (2.9 psi): 4.1 m³/h (18.0 gpm)
• Flow @ Δp = 0.5 bar (7.3 psi): 6.7 m³/h (29.5 gpm)
• Operating pressure (min/max): 2.5–16 bar (36.2–232 psi)
• Dimensions (H × W): 352 × 203 mm (13.86 × 7.99 in)
• Installation orientation: Horizontal or vertical
• Material: Lead-free (LF)

Installation Tips

1. Install at the main water inlet after the water meter.
2. Select horizontal or vertical orientation based on space and drain access.
3. Ensure access to the drain connection for backwashing.
4. Run an initial backwash after installation.
5. Backwash every 6 months, or more often if sediment levels are high.

Technical Data

*RSF = Backwash filter.